Christina Aguilera Credit: Robert Erdmann for Lucky

Christina Aguilera's fluctuating weight doesn't bother her as much as it seems to bother her critics.

Appearing on the October cover of Lucky, the Pennsylvania-raised Grammy Award winner opens up about her curvier shape, telling the magazine she's happy to show off her fuller figure in a myriad of tight outfits.

"The challenge I've always had is being too thin, so I love that now I have a booty," Aguilera explains. "And, obviously, I love showing my cleavage."

Though her shapely appearance has often been the subject of ridicule, Aguilera doesn't pay attention to the naysayers. "Hey, if you can work it and you can own it, that confidence is going to shine through," the blonde star says.

Aguilera wasn't always so confident in her own skin. When her career was just taking off, the pop princess struggled to find her own voice. "When you're young, it's so easy to get bull­dozed," she says. "There were these two ladies who worked at the record label who always wanted to come to fittings and dress me up like a Barbie doll. It was disgusting."

Dating production assistant Matthew Rutler since late 2010, the Voice mentor (and mom to Max, 4, with ex-husband Jordan Bratman) is eager to share her new music with fans.

"If you love 'Fighter,' you're going to love my new album," she tells Lucky, referencing her triumphant hit single from her 2002 sophomore album, Stripped. "As a 31-year-old woman, I've been uncovering my independence, and it's been really fun to explore in the new songs."