The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

US-MUSIC-GRAMMY AWARDS-SHOW

Rihanna performs on stage at the Staples Center during the 55th Grammy Awards in Los Angeles, California, February 10, 2013. AFP PHOTO Joe KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

US-MUSIC-GRAMMY AWARDS-SHOW

Rihanna performs on stage at the Staples Center during the 55th Grammy Awards in Los Angeles, California, February 10, 2013. AFP PHOTO Joe KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

US-MUSIC-GRAMMY AWARDS-SHOW

Rihanna performs on stage at the Staples Center during the 55th Grammy Awards in Los Angeles, California, February 10, 2013. AFP PHOTO Joe KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

US-MUSIC-GRAMMY AWARDS-SHOW

Rihanna performs on stage at the Staples Center during the 55th Grammy Awards in Los Angeles, California, February 10, 2013. AFP PHOTO Joe KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

US-MUSIC-GRAMMY AWARDS-SHOW

Rihanna performs on stage at the Staples Center during the 55th Grammy Awards in Los Angeles, California, February 10, 2013. AFP PHOTO Joe KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage during the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)

The 55th Annual GRAMMY Awards - Show

LOS ANGELES, CA - FEBRUARY 10: Singer Rihanna performs onstage during the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)