For some reason I find it really hard to believe that you would just NOW realize that you seen her last year... And you only remember because of her outfit and dancing. The name Lady GaGa and those songs are not something someone is going to forget and then all the sudden just remember after being a fan for last couple months... So yeah, I'm calling bullshit
Anyways, great performance in the video you posted
She sure does know how to work it even without all the things she has now.