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10/30/2014 10:56 am ET

Liv Tyler's 'Bun In My Oven' Halloween Costume Couldn't Be Cuter

It's not even Halloween yet and expectant mama Liv Tyler already has a leg up on the competition with her "bun in my oven" costume.

Tyler revealed her adorable Halloween costume on Instagram Wednesday. The costume consisted of a fabric white oven with a bun in the window right over her belly. She paired it with black pants and a retro up-do for a night out.

Reports of the actress' pregnancy first surfaced last month. The 37-year-old is already mom to son Milo with British musician Royston Langdon. She is currently dating David Beckham's friend Dave Gardner.

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

A photo posted by Liv Tyler (@misslivalittle) on

Bun in my oven... 💗💘💕

Uma foto publicada por Liv Tyler (@misslivalittle) em

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