Credit: Courtesy of Liv Tyler

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

Una foto publicada por Liv Tyler (@misslivalittle) el Oct 10, 2014 at 5:20 PDT

Ha! Pregnant Liv Tyler is making good use of her baby bump. The second-time mom-to-be dressed up as a "bun in the oven" for Halloween!

"Halloween school dance. My favorite party!!!!!" Tyler captioned a photo of herself on Instagram on Wednesday, Oct. 29, wearing the adorable costume, which resembled an oven with a bun in it over her midsection. In case it wasn't obvious enough, Tyler shared another snap of herself with the caption: "Bun in my oven."

Bun in my oven... ????????????

Uma foto publicada por Liv Tyler (@misslivalittle) em Out 10, 2014 at 5:30 PDT

As previously reported by Us Weekly, the Leftovers actress, 37, is currently dating David Beckham's BFF Dave Gardner. Tyler was first snapped sporting a tiny baby bump in a bikini while on vacation with her beau in Spain this past August.

The actress is already a proud mom to 9-year-old son Milo William Langdon, whom she shares with ex-husband Royston Langdon. Gardner has two children of his own with ex-wife Davinia Taylor.