January 12, 2014 09:30 PM

Jason Merritt/Getty

Dressing for the Golden Globes this year had one — make that two — very special perks for Olivia Wilde.

“It’s great — I’ve never had boobs before!” the actress, 29, joked to E!’s Ryan Seacrest as he complimented Wilde’s emerald sequined Gucci gown, which she paired with an Emm Kuo clutch and a Forevermark ring.

Her decision to choose a floor length form-fitting dress was deliberate, the mom-to-be explained to PEOPLE after the show.

“Until about a week ago, I just looked fat,” she admits. “I wanted to be like, ‘I’m not fat, I’m pregnant!'”

While Wilde was excited to put her baby bump on display, she wasn’t the only one ecstatic to be attending the show: her son (yes – it’s a boy, she confirms to PEOPLE) was bouncing around in her belly.

“He was kicking the whole time, going, ‘Where are we?!'” she said.

Currently appearing in Her, Wilde revealed the due date of her next big project — her and fiancé Jason Sudeikis‘s first child.

Although she told PEOPLE that she’s due “at the end of April,” Wilde made a Star Wars joke to Seacrest when asked about the specific date, indicating baby could actually make his arrival the following month.

“May the fourth be with you,” she replied, explaining that’s how she remembers it, anyhow.

— Sarah Michaud with reporting by Aili Nahas

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