Khloe Kardashian penned a sweet tribute to her ex, Tristan Thompson‘s, brother Amari in celebration of his 18th birthday on Instagram on Saturday.

The TV personality, 40 – who recently looked unrecognizable in a fun throwback snap with the Haqq twins – uploaded the post to her main page, while the NBA star, 33, and Kris Jenner also shared birthday wishes of their own.

Alongside an assortment of photos of herself with Amari over the years, Khloe wrote a heartwarming caption which read: ‘Happy 18th Birthday sweet angel Amari!!’

‘I can’t believe you are 18! You have changed our lives in the best possible ways! Thank you for being an angel to us all!’

The reality star concluded with, ‘You are the sweetest, silliest and most loving young man. I hope you feel how much we love and adore you our sweet angel Amari,’ followed by a blue heart emoji.

Khloe Kardashian, 40, penned a sweet tribute to her ex, Tristan Thompson’s, brother in celebration of his 18th birthday on Instagram on Saturday

She also wrote a heartwarming caption which read: ‘Happy 18th Birthday sweet angel Amari!!’

In one image, the Good American founder paused for a quick selfie with the 18-year-old while spending time on a spacious patio outdoors.

Another photo showed Amari – who suffers from a severe form of epilepsy called Lennox-Gastaut syndrome (LGS) – with Khloe as they watched a film inside a movie theater.

The mother-of-two included other selfies that she had taken with Tristan’s younger brother, as well as a clip of her son Tatum bonding with Amari.

In a short reel that was also shared to the Instagram carousel, Tatum could be seen laying a kiss on Amari’s cheek as he slept.

One picture showed Amari posing with his late mother, Andrea, who passed away last year in January 2023 after suffering from a heart attack in her Toronto home.

Despite their split, Khloe supported Thompson as he mourned the loss of his mother by attending the funeral in Canada, and was also joined by Kim Kardashian and Kris Jenner.

Earlier this year in February, Tristan became Amari’s legal guardian – 13 months after Andrea’s shock passing.

Lastly, Khloe included a photo that was taken at what appeared to be a birthday bash for the 18-year-old.

‘I can’t believe you are 18! You have changed our lives in the best possible ways! Thank you for being an angel to us all!’ she added

The reality star concluded with, ‘You are the sweetest, silliest and most loving young man. I hope you feel how much we love and adore you our sweet angel Amari,’ followed by a blue heart emoji

The mother-of-two included other selfies that she had taken with Tristan’s younger brother, as well as a clip of her son Tatum bonding with Amari

One picture showed Amari posing with his late mother, Andrea, who passed away last year in January 2023 after suffering from a heart attack in her Toronto home

Earlier this year in February, Tristan became Amari’s legal guardian – 13 months after Andrea’s shock passing

Lastly, Khloe included a photo that was taken at what appeared to be a birthday bash for the 18-year-old

In the picture, Amari could be seen surrounded by loved ones, such as three of Kim’s children: North, 11, Saint, eight and Chicago, six. Two of Kourtney’s kids, Penelope, 12, and Reign, eight, also appeared in the snap.

The group stopped to take the photo while standing inside a large kitchen, with a variety of blue balloons close by in the distance.

Her followers jumped to the comment section to also ring in Amari’s birthday, with one fan typing out, ‘Khloe, your heart is everything! Adore you and your fierce love for everyone you love! Forever my favorite!’

‘Awww Tatum kissing him Happy Birthday Amari ❤️,’ another wrote, while a follower added, ‘Awww! Happy birthday to this sweet angel! ❤️❤️❤️❤️.’

Tristan –  who currently plays for the Cleveland Cavaliers – also took to his own Instagram account to celebrate his sibling’s birthday on Saturday.

In his caption, the sports player penned, ‘Happy birthday, Amari! Big number 18! We are so blessed and fortunate for all the blessings that you bring to our lives!’

‘You are always a beacon of light! I love you so much and I’m so so blessed to be your older brother.’

Thompson flashed a cheerful smile in the first image shared to the post while standing underneath a shady patio next to Amari.

Tristan – who currently plays for the Cleveland Cavaliers – also took to his own Instagram account to celebrate his sibling’s birthday on Saturday

He paused for another snap during the birthday party with Amari as well as children Tatum and True – whom he shares with ex Khloe

Tristan also shared two photos as he posed with his sibling and his late mother in loving photos, as well as other images he took with his brother in the past

In his caption, the sports player penned, ‘Happy birthday, Amari! Big number 18! We are so blessed and fortunate for all the blessings that you bring to our lives!’

‘You are always a beacon of light! I love you so much and I’m so so blessed to be your older brother,’ he added

Another image showed Amari with Tatum and True as they spent quality time together outdoors in the warm weather

Thompson flashed a cheerful smile in the first image shared to the post while standing underneath a shady patio next to Amari

Additional blue balloons were also placed behind the pair, with one having the words ‘Happy Birthday Amari’ printed in white lettering.

He paused for another snap during the birthday party with Amari as well as his children Tatum and True – whom he shares with ex Khloe.

Tristan also shared two photos as he posed with his sibling and his late mother in loving photos, as well as other images he took with his brother in the past.

Another image showed Amari with Tatum and True as they spent quality time together outdoors in the warm weather.

Kris Jenner also shared sweet birthday wishes to the 18-year-old by jumping to her main Instagram page.

‘Happy 18th birthday Amari!!! You are the sweetest, most special soul and we all love you so very much,’ the reality star began.

‘Each and every time we are together I am grateful for the lessons you teach me. I thank God every day for your spirit and the love that you give.’

Jenner added, ‘Thank you for showing us what pure love is. I love you to the moon and back, Lovey xo ❤️ @realtristan13 @khloekardashian.’

Khloe jumped to the comment section to respond to her mother’s post and typed, ‘I really can’t believe he’s 18!! Let’s get ready to celebrate our angel boy…. Excuse me, angel young man.’

Kris Jenner also shared sweet birthday wishes to the 18-year-old by jumping to her main Instagram page

Kris also uploaded photos of Amari spending time with the family, such as Khloe posing with Tristan’s brother and her children at the annual Kardashian/Jenner Christmas party

Another was taken as Jenner joined her daughter Khloe as well as Amari and True during a relaxing outing outdoors

Kris also uploaded photos of Amari spending time with the family, such as Khloe posing with Tristan’s brother and her children at the annual Kardashian/Jenner Christmas party.

Another was taken as Jenner joined her daughter Khloe as well as Amari and True during a relaxing outing outdoors.

Despite their split, Khloe and Tristan have seemingly continued to move forward to positively raise their children and focus on family.

The former couple began dating in 2016 – and welcomed their first child, True, in April 2018.

However, Tristan cheated on the TV personality when she was pregnant with their daughter. After the shock news broke, the pair remained together.

In response to a social media user on Twitter that same year, Khloe had expressed, ‘You have no knowledge of what goes on in our household or the enormous rebuilding this takes to even coexist.’

‘I’m proud of my strength. I appreciate your opinion and I hope you hold that same opinion to everyone else who has stayed in situations.’

The following year in 2019, the two split after Thompson kissed Kylie Jenner’s former BFF Jordyn Woods at a party – but reconciled during the Covid-19 pandemic after they quarantined together.

In June 2021, the pair once again ended their relationship, while a source told Us Weekly at the time that the stars ‘remain amicable toward each other and will continue to coparent.’

Khloe jumped to the comment section to respond to her mother’s post and typed, ‘I really can’t believe he’s 18!! Let’s get ready to celebrate our angel boy…. Excuse me, angel young man’

Despite their split, Khloe and Tristan have seemingly continued to move forward to positively raise their children and focus on family

Later that same year, Maralee Nichols sued Tristan for child support after she welcomed their son earlier that month.

She had become pregnant when Thompson was still dating Khloe – and after taking a paternity test, it was confirmed that he was the father of the baby boy.

The basketball pro issued an apology to Khloe, stating, ‘you don’t deserve this. You don’t deserve the heartache and humiliation I have caused you.’

‘You don’t deserve the way I have treated you over the years. My actions certainly have not lined up with the way I view you. I have the utmost respect and love for you. Regardless of what you may think. Again, I am so incredibly sorry.’

On July 28, 2022, the pair welcomed their second child – son Tatum – via surrogate.

Along with his son, Theo, whom he shares with Nichols, Thompson is also father to Prince. He welcomed the baby boy with ex, Jordan Craig.

Following his numerous cheating scandals, both he and Khloe have seemingly put the past behind them. Last month, the pair were seen grabbing a bite to eat together at Nobu in Malibu.

And during an episode of Hulu’s The Kardashians which also aired in June, the beauty revealed whether the ‘door is closed’ regarding rekindling a romance with the NBA player.

In June 2021, the pair once again ended their relationship, while a source told Us Weekly at the time that the stars ‘remain amicable toward each other and will continue to coparent’; seen in 2018 in L.A.

And during an episode of Hulu’s The Kardashians which also aired in June, the beauty revealed whether the ‘door is closed’ regarding rekindling a romance with the NBA player

‘I don’t want to [date]. Once I’m done with the kids at 9, I have limited time. 9:30-4pm, that’s my time. I’m not sharing it with a man. I’m not sharing my TV, I’m not sharing my bed,’ Khloe said.

When questioned by Scott Disick if there was ‘any hope for Tristan’ for them to get back together in the future, she revealed that the ‘door is closed.’

In a confessional, the businesswoman added, ‘Are you kidding me? This is life. We all gotta grow up and move on. I feel like everyone has been really judgy about how I spend my time because I’m not dating.’

‘I stopped dating Tristan when Tatum was in utero. 2.5 years without dating is not that crazy.’