Whitney tribute at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Getty Images)

Whitney performing at the Monte Carlo Sporting Club in Monaco in 1988. (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)

Whitney posing with the seven awards she won at the 21st annual American awards ceremony in 1994. (Photo by VINCE BUCCI/AFP/Getty Images)

Whitney performing on October 1, 1991. (Photo by BERTRAND GUAY/AFP/Getty Images)

Whitney performing on May 18, 1988 in Paris (Photo by BERTRAND GUAY/AFP/Getty Images)

Whitney, cousin Dionne Warwick and daughter Bobbi Kristina arrive at the 2011 Pre-GRAMMY Gala and Salute To Industry Icons Honoring David Geffen at Beverly Hilton on February 12, 2011 in Beverly Hills, California. (Photo by Getty Images)

Whitney and mother Cissy Houston at the 2010 Keep A Child Alive's Black Ball at the Hammerstein Ballroom on September 30, 2010 in New York City. (Photo by Getty Images)

Bobbi Kristina Brown and Whitney Houston perform on ABC's "Good Morning America" on September 1, 2009 in New York City. (Photo by Larry Busacca/Getty Images)

Whitney sings the National Anthem before a game with the New York Giants taking on the Buffalo Bills prior to Super Bowl XXV at Tampa Stadium on January 27, 1991 in Tampa, Florida. The Giants won 20-19. (Photo by George Rose/Getty Images)

Whitney and Bobby arrive at the 50th Annual Primetime Emmy Awards 13 September at the Shrine Auditorium in Los Angeles, CA. (Photo by NICHOLSON/AFP/Getty Images)

Whitney arrives at the International Achievment in Arts Awards with Bobby Brown and daughter Bobby Christina in Beverly Hills. Houston's charity for abused children is one of the largest benefits in the entertainment industry. (Photo by LUCY NICHOLSON/AFP/Getty Images)

Whitney waves to the crowd at the 36th Annual Grammy Awards in New York 01 March 1994 after she was honored for Record of the Year, "I'll Always Love You," and Album of the Year, the soundtrack from the film "The Bodyguard." At rear is her producer David Foster, who shared the honors with her. (Photo by POOL/AFP/Getty Images)

Whitney Houston and Denzel Washington in the new movie "The Preachers Wife". (Photo by Getty Images)

Whitney in the new movie "The Preachers Wife". (Photo by Getty Images)