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Krysten Ritter, Emmy Rossum

Jeff Vespa; Michael Simon/startraksphoto.com

It's official: Polka dots are more popular than ever these days!

Pregnant Kate Middleton stepped out in a cheerful black-and-white spotted frock yesterday afternoon, and last night Krysten Ritter turned heads in an adorable polka-dot number by Stop Staring! (a favorite of Britney Spears, among many other celebs) at the 2nd annual Hilarity for Charity event in Hollywood. 

The star styled her retro-inspired frock with red suede pumps from Aldo, classic red lipstick and a low ponytail for a flirty look that felt effortlessly chic.

Coincidentally, Emmy Rossum wore the exact same dress months ago while making an appearance on Conan, and styled it similarly with red pointy-toe pumps and red lipstick.

She wore her hair down in loose, romantic waves and added a touch of elegance with chandelier earrings. 

Both stars looked flawless (and um, exactly identical!) in this flattering knee-length frock and wisely kept accessories to a minimum with this standout pattern.

Who do you think looked best in this pretty polka-dot number?

PHOTOS: Check out the 2013 spring fashion trends