(L-R) Singer Whitney Houston, Singer Dionne Warwick and Bobbi Kristina Brown arrive at the 2011 Pre-GRAMMY Gala at Beverly Hilton on February 12, 2011 in Beverly Hills, Calif. (Larry Busacca/Getty Images/Recording Academy)
Whitney Houston performs at Mediolanum Forum on May 3, 2010 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
Singer Whitney Houston performs onstage at the 2009 American Music Awards at Nokia Theatre L.A. Live on November 22, 2009 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
Performers Whitney Houston and Ray-J sit ringside for the Joe Calzaghe of Wales and Bernard Hopkins light heavyweight bout at Thomas & Mack Center on April 19, 2008 in Las Vegas, Nevada. (Photo by John Gichigi/Getty Images)
Singer-actress Whitney Houston during the taping of "25 Strong: The BET Silver Anniversary Celebration" at The Shrine auditorium in L.A. The event highlighted 25 years of programming on Black Entertainment Television. (Vince Bucci/Getty Images)
Singer Whitney Houston is seen performing on stage during the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada. (Photo by Kevin Winter/Getty Images)
Whitney Houston, Bobby Brown and their daughter Bobbi Kristina are greeted by Mickey Mouse and Minnie Mouse at the Disneyland Resort August 7, 2004 in Anaheim, California. (Photo by Lisa Rose/Disney Parks via Getty Images)
Singer and actress Whitney Houston(R) smiles as she walks with her husband Bobby Brown next to the "Wailing Wall" or Western Wall in the old city of Jerusalem 28 May 2003. Photo: AFP/Getty Images)
Whitney Houston speaks while Christina Aguilera, Luther Vandross, Mary J. Blige, Cissy Houston and Bobbi Kristina Brown listen during the 1st Annual BET Awards June 19, 2001 at the Paris Hotel and Casino in Las Vegas. (Photo: M. Caulfield/WireImage)
Performers at the 'Divas Live--An Honors Concert for VH1 Save the Music' in New York, April 13, 1999. Pictured, from left: Brandy, Faith Hill, Chaka Khan, Whitney Houston (1963 - 2012), Mary J. Blige, and LeAnn Rimes. (PJack Vartoogian/Getty Images)
Singer Whitney Houston, singer Brandy and singer Bobby Brown attend the Screening of Walt Disney Television & ABC Present "Cinderella" on October 13, 1997 at Mann's Chinese Theatre in Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
Pop singer Whitney Houston sitting w. singer husband Bobby Brown, who is holding their infant daughter Bobbi (no caps). (Photo by Ron Wolfson/The LIFE Images Collection/Getty Images)
Singer Whitney Houston, actor Kevin Costner and wife Cindy Costner attend "The Bodyguard" Hollywood Premiere on November 23, 1992 at Mann's Chinese Theatre in Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
Whitney Houston sings the National Anthem during the pregame show at Super Bowl XXV while fans wave tiny American flags in an incredible outburst of patriotism during the Persian Gulf War on 01/27/1991. (Michael Zagaris/Getty Images)
Singer BeBe Winans, singer Whitney Houston and singer CeCe Winans attends the United Negro College Fund's 46th Annual Awards Dinner/Frederick D. Patterson Award to Whitney Houston on March 8, 1990 in New York. (Photo by Ron Galella, Ltd./WireImage)
Singer Whitney Houston holding her award in Press Room at Grammy Awards. (Photo by Time Life Pictures/DMI/The LIFE Picture Collection/Getty Images)
(L-R) American singer Whitney Houston with President of Arista Records Clive Davis at an event to celebrate Whitney's debut album 'Whitney Houston' receiving a multi-platinum award in 1985 in New York. (Photo by Peter Carrette Archive/Getty Images)
American singer Whitney Houston (1963 - 2012) performs with Jermaine Jackson at The Limelight in New York City, 1st July 1984. (Photo by Dave Hogan/Getty Images)
Young model Whitney Houston in a photography fashion session in New York City in September of 1980. Photo by Doug Vann. Silk Cheetah print dress by Giovanni Demoura. (Photo by Doug Vann/Corbis via Getty Images)
