The party drew celebrity guests like Lamar Odom and Blac Chyna.
Happy birthday, Sebastian!
While Amber Rose says she and Wiz Khalifa aren't back together, the two reunited after their steamy red carpet kiss last weekend for their son Sebastian's birthday on Sunday.
WATCH: Amber Rose Kisses Ex Wiz Khalifa, Rocks Giant Diamond Ring Pre-GRAMMYs Event
The pair went all out for Sebastian's 4th birthday, even rocking elaborate costumes for the tot's super-hero themed soiree.
WATCH: Amber Rose Gets Giant ‘Hollywood’ Tattoo After Val Chmerkovskiy Split
Sebastian had his face painted like the Joker and wore a Catboy costume. The little cutie even got into character as he wrestled with Blac Chyna's son, King Cairo, with Rob Kardashian's fiancee goofing off in the background.
WATCH: Amber Rose Rocks Skintight Bodysuit to Belly Dancing Class
Chyna wasn't the only famous face (or extended member of the Kardashian family) at the superhero fete. Khloe Kardashian's ex, Lamar Odom, also made an appearance, posing for a photo with Khalifa.
WATCH: Val Chmerkovskiy Addresses Amber Rose Split for the First Time: 'I'll Always Have Her Back'
Rose and Khalifa clearly have no problem coming together for their son, despite Rose's recent insistence that she's single.
"Wiz and I are family and we will be family for the rest of our lives," Rose wrote in a now-deleted Instagram post last week. "A kiss on the lips for a photo and a fun night out is not a big deal for either of us, we are in a great place but we are very much still divorced and not together."
The model and TV personality recently ended a five-month relationship with Dancing With the Stars pro Val Chmerkovskiy.
See more in the video below.