October 21, 2014 10:00 AM

Not so mellow yellow!

For the first time since announcing they’re expecting their first childRyan Reynolds and Blake Lively stepped out as a couple while attending the Angel Ball at Cipriani Wall Street on Monday.

The proud parents-to-be were all smiles as they made their way down the carpet. But the actor, 37, only had eyes for his leading lady — and once we saw the mom-to-be’s fitted, floor-length frock we knew why.

Lively, 27, showed off her growing bump in a beautiful butter-hued gown from Gucci’s Resort 2015 collection, complete with a plunging embellished neckline.

And while the Preserve founder accessorized with Lorraine Schwartz jewels, it was her gorgeous glow that really took her evening look to another level.

AKM-GSI

On Thursday, Lively told PEOPLE she’s having to switch up her pregnancy ensembles to accommodate her growing bump.

“Have you seen me!?” she joked. “I’m gonna amp up my style by wearing things that are stretchier — because that’s all that fits!”

Although the couple haven’t announced whether they’re expecting a baby girl or boy, Reynolds already has a few names in mind.

“I don’t want a name that’s anything pretentious or, like, Hollywood-y. So I’m going with Excalibur Anaconda Reynolds … that’s if it’s a girl,” he recently joked.

— Anya Leon

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