This season, she's doing it for a good cause.

The Grammy nominee, who made the cover of this year's Paper magazine Beautiful People issue, has joined artists like N.E.R.D. and Estelle in designing a signature line for Fashion Against AIDS.

"I like things that are different, I'm very girly," the 24-year-old singer gushed.

Her piece: a trendy bodysuit. "It reminded me of something a teenage girl would wear to a dance class ... and it wasn't just like, here's a T-shirt!"

The artist would wear her onesie to "work out in the summer, lounge by the pool, or do some gardening in."