Taylormomsen Does Rufus Humphrey know where his daughter is? 

Spotted: Little J on stage last night in New York City, singing with her brand new band, Pretty Reckless.

Yep, "Gossip Girl"'s Taylor Momsen is a 15-year-old of many talents. And, maybe I'm crazy, but I think she's kind of awesome up there. I like what she's doing…