Oh Yes...It's GaGa!!! She's always been a fan!
Lady GaGa was spotted, PERCHED, at the Britney Spears concert at the Boardwalk Hall Arena in Atlantic City, New Jersey on Saturday night.
Britney decided to shout out Lady G by saying, "Lady Gaga is in the house! It is such an honor to have her here." As the crowd went crazy of course!
Love to see old broads supporting each other!
Images: Getty Images