Which Celeb Forgot Her Pants?

Maybe this songbird is so excited about her recent engagement that she stopped caring about covering up when she goes out?
She went on a coffee run wearing a leotard, lacy leggings and not much else, despite chilly L.A. temps.
Think you know who's stepping out sans pants? Find out after the jump...

It's Katy Perry, getting her Starbucks fix and giving onlookers an eyeful in process.
Has fiancé Russell Brand's kooky style rubbed off on her?
Then again, Katy's no stranger to showing skin. An American Idol hopeful called her out on last night's episode for her low-cut top.

source : eonline.com