The 24-year-old singer, who swept the board with six Grammys at last year's awards show, took the prize for a live rendition of her hit "Set Fire to the Rain."

"My good luck charm, J-Lo," she said as she accepted the award from Jennifer Lopez and Pitbull. "This is amazing. I wanted to come and be part of the night. I loved it last year, obviously," she added.

Last year she won best song, best record, best album for her breakthrough "21," best short video, best pop album and best pop artist, winning all six categories in which she was nominated.