Jennifer Lopez learned that beauty really is pain when her spiky Christian Louboutin's punctured her left ankle and drew blood during the Grammy Awards in Los Angeles on Sunday.

"Paramedics got a frantic call to rush to JLo's dressing room," a Staples Center source told Breaking Celebrity News exclusively.

"Her stylist was freaking out because Jennifer accidentally punctured herself with one of the many spikes on her shoes. It was a small puncture, but the blood wouldn't stop and J-Lo still had to present an award."

According to the source, EMT's rushed in and applied some antiseptic, slapped a Band-Aid on it and the new American Idol judge was good to go -