Celebrities react to Michael Jackson's death

Muhammad Ali, wife Veronica, and Michael Jackson (Photo by Ron Galella/WireImage)

FILE - In this Jan. 30, 1981 file picture, Michael Jackson, right, and Diana Ross hold their American Music Awards in Los Angeles. Jackson won for favorite soul album and Ross won for favorite female soul vocalist. (AP Photo)

(FILES) Photo dated on December 19, 1983 shows British singer Paul McCartney and US pop star Michael Jackson (R). Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring for the tortured music icon revered as the \"King of Pop.\" AFP PHOTO (Photo credit should read -/AFP/Getty Images)

Michael Jackson & Cher at the Dreamgirls opening night after party inside. Taken in Los Angeles at the Shubert theater in Century City on March 20, 1983. (Photo by Barry King/WireImage)

(FILES) US pop star and entertainer Micheal Jackson (R) and actress Brooke Shields arrive at the shrine Auditorium in Los Angeles where Jackson is expected to run away with a major part of the Grammy awards on Febuary 28, 1984. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in on June 26 for the tortured music icon revered as the \"King of Pop.\" AFP PHOTO/Alan ZANGER (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

FILE - In this Feb. 26, 1986 file picture, Grammy winners Dionne Warwick, Stevie Wonder, Quincy Jones, Michael Jackson and Lionel Richie pose together backstage at the Grammy Awards show in Los Angeles. Jackson has died in Los Angeles at the age of 50 on Thursday, June 25, 2009. (AP Photo)

Madonna and Michael Jackson at the Spagos in West Hollywood, California (Photo by Ron Galella/WireImage)

Michael Jackson, Jackson 5 and Bee Gees in , (Photo by Kevin Mazur/WireImage)

File - Pop star Michael Jackson and his wife Lisa Marie Presley wave to photographers as they visit the Versailles castle near Paris in this Sept. 5, 1994 file photo. Jackson, the \"King of Pop\" who once moonwalked above the music world, died Thursday as he prepared for a comeback bid to vanquish nightmare years of sexual scandal and financial calamity. He was 50. (AP Photo/file/Laurent Rebours, File)

epa01774774 (FILE) US singer Michael Jackson performs with the guitarist Slash during the benefit concert 'Michael Jackson&Friends' at Olympic Stadium in Munich, Germany, 27 June 1999. Michael Jackson, the self-appointed 'King of Pop', died unexpectedly on 25 June 2009, aged only 50, after suffering a cardiac arrest. When the ambulance arrived at his house in Los Angeles, Jackson had already stopped breathing; reanimation was not successful. EPA/VOLKER DORNBERGER

CAPE TOWN, SOUTH AFRICA: South African President Nelson Mandela (L) and US singer Michael Jackson clasp hands at a press conference at the President's home Genadendal in Cape Town 23 March 1999. Michael Jackson announced his latest project, 'Michael Jackson and Friends - The Adventure of Humanity' which will raise money to aid needy people around the world. The Nelson Mandela Children's Fund, UNESCO and the Red Cross are amongst the organisations which will benefit from the project which will include two concerts. (Photo credit should read ANNA ZIEMINSKI/AFP/Getty Images)

Michael Jackson and Britney Spears backstage at the 2002 MTV Video Music Awards at Radio City Music Hall in New York City, August 29, 2002. Photo by Frank Micelotta/ImageDirect.

SANTA MARIA, CA - AUGUST 16: (FILE PHOTO) Defendant Michael Jackson with sisters LaToya Jackson (L) and Janet Jackson exit the Santa Maria courthouse for break during the evidentiary hearing in the Michael Jackson child molestation case August 16, 2004 in Santa Maria, California. The iconic pop star, 50, was rushed to a Los Angeles hospital June 25, 2009 after going into cardiac arrest, receiving CPR in the ambulance, according to reports. (Photo by Ed Souza-Pool/Getty Images)