Amber Rose and Wiz Khalifa hosted a star-studded birthday celebration for their son Sebastian on Sunday, which included Blac Chyna and Lamar Odom.

Sebastian’s fourth birthday party in the backyard included a DJ booth, a speech by the birthday child, a magic performance, and a three-layer birthday cake.

Lamar, 37, dressed cool and casual for the party in a grey sweatshirt, blue pants, and light blue high-tops.The former Los Angeles Lakers star posted an Instagram photo of himself and Wiz.

‘Hanging out with my man @wizkhalifa at Sebastian’s birthday party,’ Lamar wrote in the post. She dressed in an Adidas ensemble featuring a vibrant nature scene and a denim jacket to celebrate with her old friend Amber.

Rob Kardashian’s 29-year-old on-and-off lover danced while wearing a black beanie and holding a bottle of water.

Chyna and Rob, who have a 14-week-old daughter Dream together, have dissolved their troubled relationship yet again, according to a Us Weekly article published Thursday.

Lamar’s divorce from Khloe Kardashian, 32, was finalized in October, after she filed for legal separation in December 2013.

Khloe and Lamar got married in September 2009, exactly one month after meeting at a gathering for his former Lakers colleague Ron Artest.

Their wedding was shown on Keeping Up With The Kardashians, and they starred in their own spin-off series, Khloe & Lamar. Khloe ended divorce proceedings in October 2015 after Lamar was discovered unconscious at a Nevada brothel.

Lamar recovered from many strokes and kidney failure.

The former Lakers and Clippers great is set to participate in a reality series that will follow his recovery from years of drug addiction.The Queens, New York native checked into a treatment facility in December for a 30-day stay as a ‘precautionary measure,’ according to a source.

Last month, Lamar appeared on The Doctors and admitted that his drug use was akin to committing suicide.

Amber and Wiz began dating in 2011, became engaged in March 2012, and married in July 2013, after delivering Sebastian in February 2013.They separated in 2014, with Amber alleging irreconcilable reasons, and they share joint custody of Sebastian.

Amber competed in season 23 of Dancing With The Stars last year, finishing ninth with professional partner Maksim Chmerkovskiy.

She dated his brother, Val Chmerkovskiy, for five months before their breakup earlier this month.