PHOTO GALLERY: Taylor Momsen Lost Her Pants

And we thought Miley Cyrus acted old for her age.

Gossip Girl star Taylor Momsen wore this racy lingerie number to perform with her band Pretty Reckless last night at a NYC Fashion Week Event.

She’s 16-years-old. No joke. Wearing sequined panties and a garter belt. See for yourself.

Have your say in the comments section: What the heck is Taylor and/or her parents thinking?