Whitney Houston poses with her Grammy after she was named Best Pop Vocal Performer - Female at the 30th annual Grammy Awards at New York's Radio City Music Hall, in this March 2, 1988 file photo. [Photo/Agencies]

Whitney Houston bows after performing "I Didn't Know My Own Strength" at the 2009 American Music Awards in Los Angeles, California, in this Nov 22, 2009 file photo. [Photo/Agencies]

Whitney Houston gestures at the Clive Davis pre-Grammy party in Beverly Hills, California, in this file photo taken Feb 9, 2008. [Photo/Agencies]