Lamar Odom is still keeping up with the Kardashians.

After all, the former NBA star couldn't help but share some love for Rob Kardashian under a sweet birthday message from big sister Khloe Kardashian. 

The Rob & Chyna alum received an outpouring of celebratory messages from family and friends for his 37th birthday on March 17, including Khloe, who couldn't help but include kids True Thompson, 5, and Tatum Thompson, 19 months, with a musical number for their Uncle Bob. 

And Lamar, who tied the knot with the Kardashians star in 2009 before getting divorced in 2016, wrote in the comments, "My Family!!" 

Lamar and Rob formed a close bond throughout the athlete's relationship with Khloe. And even though their marriage came to an end, Lamar has continued to show love for the Kardashian family, as they've shown him in return. 

Unsurprisingly, Khloe's darling message attracted some love from others, including the former L.A. Lakers player. As one fan noted, "One thing about Khloe is that she always has the best bday tributes." And Rob's was no different, which included throwback photos of the two, as well as True and Tatum singing "Happy Birthday."

"Robert I couldn't be prouder or more honored to say I am your sister," Khloe wrote on Instagram March 17. "I couldn't be prouder to be living life with you. I couldn't be luckier that I get to call you whenever I want about absolutely nothing. And the coolest part is, you actually answer the phone for me ha! I thank God every day for our relationship and the relationship that our children get to have."

The Good American founder also shared some sisterly advice with Rob, who shares Dream Kardashian, 7, with ex Blac Chyna.

"Be the greatest person you can possibly be," she reflected. "Do things that make you proud. For you to have gratitude for even the smallest of things. Surround yourself with people who bring out the best of you. Believe in yourself and in your journey."

While Rob's 37th birthday may be over, keep reading to reflect on his journey over the years.

Kris Jenner welcomed her only son and youngest child with Robert George Kardashian, named Robert Arthur Kardashian, on St. Patrick's Day in 1987.

Robert and Rob couldn't look more alike in this throwback snap.

A bleach-blonde Rob smiles from ear-to-ear for a photo with sister Kylie Jenner.

As you can see from this vintage pic, Rob and sister Khloe Kardashian have always been close.

Rob and Khloe pose for another sibling snap

Rob enjoys crystal clear water while abroad.

Rob joins mom Kris, sisters Kim and Khloe on the red carpet at the Kardashian Charity Knock Out at the Commerce Casino in November 2009.

For Kim's birthday in 2010, siblings Rob, Khloe and Kourtney hit up the TAO Nightclub with the birthday girl in Las Vegas.

Khloe supports brother Rob at the 2011 BBVA NBA All-Star Celebrity Game in Los Angeles, Calif.

The Keeping Up With the Kardashians alum plants a kiss on then-girlfriend Rita Ora.

Rob receives a sweet touch from Rita in this black-and-white photo.

Rob beams with pride in this solo shot from his Arthur George launch at Neiman Marcus.

Rob and sister Kim hit the red carpet at the World's Most Beautiful magazine launch event at Drai's Hollywood in August 2011.

The Keeping Up With the Kardashians siblings attend the E! 2012 Upfront in New York City.

Rob rings in his 26th birthday at the 1 OAK Nightclub at the Mirage in March 2013.

Rob enjoys a pulled pork sandwich in Malibu in this #tbt from 2015.

Khloe and Rob catch some Zzzs in this Instagram photo.

Kylie and Rob spend some quality time together.

After three months of dating, Rob and Blac Chyna announce their engagement on April 5, 2016.

Following their engagement, Rob and Chyna step out for his birthday at the Hard Rock Cafe in Hollywood on May 10, 2016.

In May 2016, Rob and Chyna announce they're expecting a baby together. The twosome reveal they are having a little girl in September 2016.

Rob and Chyna welcome daughter Dream Kardashian on November 10, 2016.

Rob shows love to his infant daughter Dream.

The father of one watches over his little one as he helps her float in the pool.

Dream looks comfortable in the water in this snap with her father.

Rob has mom Kris, known as Lovey to her grandchildren, spend quality time with baby Dream.

Dream's parents give her a magical day at Disney, including a moment with Minnie Mouse!

Dream can't stop giggle as dad Rob lifts her in the air.

The super private star proudly holds up his only child.

Dressed as a character from Trolls, Rob poses for a Halloween photo with mom Kris in 2019.

For the latest breaking news updates, click here to download the E! News App