Olivia Wilde pregnant Jason Sudeikis
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Her bun in the oven is starting to get big!

Olivia Wilde stepped out in L.A. today wearing spandex pants, a t-shirt, and a leather jacket, and it seems her baby belly has finally popped!

The actress, who is expecting her first child with fiance Jason Sudekis, has reportedly been practicing Pilates throughout her pregnancy, which may explain why she's in such great shape everywhere else!

We wonder when the brunette beauty and her SNL funny man are going to tie the knot?

She could go the Jessica Simpson route and put the baby carriage before marriage, or she could pull a Jennifer Love Hewitt and have a secret ceremony before welcoming her bundle of joy!