Taylor Momsen Lights Up London (PHOTOS)

Taylor Momsen actually almost smiling? Mark your calendars, people, because this will surely go down as a momentous day in history.

The Gossip Girl problem child appeared to be in pleasant spirits as she emerged from a private residence in London, following a photo-shoot on Saturday. The multi-talented 17-year-old, who’s currently touring the UK with her band The Pretty Reckless, performs at the O2 ABC in Glasgow on Monday night.

Hit up the photo gallery to see T-Moms lighten up for the camera. And make sure to check out Celebuzz’s comprehensive collection of Taylor Momsen’s Craziest Quotes to bask in her words of wisdom.