Beauty is pain!
The reality star posted a Snap of her legs after the event, and they looked like an annoyed cat had gone on the attack.
Rubie's Costume Co., the company with the license to create the costumes, are expecting to over 1 million of them!
Howard Beige, the executive VP at Rubie's said: "As a personality, Lady Gaga is the single most popular costume we've sold for adults in our 59 years in business."
Will U be dressing up like GaGa???