Lindsay Lohan was in the building at Q102 Jingle Ball in Philadelphia!

Ed Sheeran told Q102 DJ Maxwell backstage that he was hanging out with Lindsay, who must have been in attendance to see her man-crush, Max George of The Wanted. (If you've been living under a rock out of the loop, Lindsay was thrown in jail after allegedly punching a girl in the face for talking to Max George after The Wanted's NYC show with Justin Bieber last week. The next night, Jay McGuinness sported a "Free Lindsay" tee at their show.)

Looks like Max and Lindsay are 'on' enough for her to make the trip to Philly... She was spotted backstage at the Wells Fargo Arena in Philadelphia signing an autograph sporting bright red hair and a winter cap, just before she entered the catering room with - you guessed it - The Wanted.

Also on the bill at Q102's Jingle Ball: Cher Lloyd, Ed Sheeran, Olly Murs, Justin Bieber and more. No word yet on whether Lindsay has come down with the Bieber Fever.

Photo by Brian Friedman for Q102