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 pair couldn't help but goof off even when they looked extra spooky.
Here's what it looks like to live like an A-lister!
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.
To help get Scott out of his funk, Kris and Khloe encourage him to embrace the Lord Disick persona -- and then immediately regret it.
Rob Kardashian is confronted by his sisters for missing his grandmother's birthday on Sunday's episode of 'Keeping Up with the Kardashians'.
The 28-year-old model is quickly approaching her due date.
