Plus, see pics from her early birthday celebration!
Way to go, Rob!
She also joked that her future sister-in-law, Blac Chyna, thinks she's having the baby with Khloe!
The reality star opened up about her beau and forthcoming niece on Thursday's 'Jimmy Kimmel Live.'
The model celebrated her big day with two parties on Wednesday night.
The pair couldn't help but goof off even when they looked extra spooky.
Chyna showed off their costumes on Snapchat
The pregnant model wore her fiance's trademark all-black outfit and L.A. Dodgers cap.
The star took to her app to speak out.
The star says she wakes up and "nothing can move."
Kim was previously expected at the annual Angel Ball in New York City.
Khloe went as Storm from X-Men, while Tristan was Black Panther.
She also showed off her baby bump on Snapchat.
Rob Kardashian is confronted by his sisters for missing his grandmother's birthday on Sunday's episode of 'Keeping Up with the Kardashians'.
