Liv Tyler's Pregnant Mom-to-Be Halloween Costume: a Bun in the Oven!

Liv Tyler steps out of her apartment and tries to keep her baby bump hidden on Wednesday (October 29) in New York City.

The 37-year-old pregnant actress posted pictures that same day of her at a Halloween bash, where she had the cutest costume: a bun in the oven!

“Bun in my oven… �’��’��’�” Liv captioned one of the pics on her Instagram. “Halloween school dance. My favorite party!!!!!” she added.

Check out one of the pics below!

Click inside to see more pics of Liv’s costume…

10+ pictures inside of Liv Tyler out in New York City before getting ready for Halloween…