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.
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.