To perform her new pop single “Somebody to Love” at this week’s Jingle Ball concert in NYC, Leighton Meester ditched the Park Aveue-worthy red carpet dress (by Cushnie Et Ochs) that she wore to the event for a costume that showed off more than just her singing talent.

This is not the first time Leighton has mistaken her lingerie for outerwear. Check out the http://www.mylifetime.com/all-the-looks/all-the-looks-insider-blog/dare-...
" target="_blank">scary topless look she wore to the "New Moon" premiere back before Halloween.

Photos: Jordan Strauss/WireImage; Todd Williamson/WireImage