Credit: C Flanigan/FilmMagic

Hilary Duff may be a fan of cupcakes -- she even brought them for the cast and crew of Gossip Girl while shooting as a guest star last fall -- but she sure doesn't want to look like one on her wedding day!

The newly engaged actress, 22, tells that she's nervous her wedding dress will make her look like the tasty treat.

"I want it to be girlie and kind of on the bigger side but not too overwhelming because I'm so small," she tells Us. "I mean, people would be like, 'Whoa, cupcake!'"

Duff -- whose hockey player beau of two years, Mike Comrie, proposed while on vacation in Hawaii on Feb. 18 -- tells Us that she "came home to a big stack of magazines from my family" and has "tear sheets all over my house" in her quest to find the perfect gown.

"It's very exciting!" she tells Us of planning the big day.

Although she doesn't "have any kind of date set," the star does know who will be her maid of honor: big sister Haylie, 25.

As for the location?

"No idea," she tells Us. "But if I did, I'm not telling!