Pregnant women can find themselves a bit more limited in the Halloween costume department, but not Liv Tyler!

The 37-year-old Leftovers star got clever and creative this year, showcasing her growing baby bump as a literal "bun in the oven" - complete with an oven window!

Halloween school dance. My favorite party!!!!!

A photo posted by Liv Tyler (@misslivalittle) on Oct 10, 2014 at 5:20pm PDT

Liv took a photo of the ensemble on her way to a Halloween party this Wednesday (Oct. 29).

“Halloween school dance. My favourite party!!!!” the actress wrote in a caption.

More: Top 34 celebrity Halloween costumes of 2013

The first sighting of the expectant mother’s bump was on a trip to Spain in August with boyfriend Dave Gardner, a pal of David Beckham with whom the actress was set up by Kate Moss.

© Getty

This will be the second child for Liv, who has 9-year-old Milo William Langdon with her ex-husband, rocker Royston Langdon.