Muhammad ali spars with the stars

* AP Photo BOP THE BEATLES, 1964 Paul, John, Ringo and George absorb a shot the day before Ali, then named Cassius Clay, won the world heavyweight championship from Sonny Liston. 1 of 16 *

Bettmann Archive/Getty Images ‘TIMBER,’ 1971 A proposed boxing match between Ali and 7-foot 1-inch basketball legend Wilt Chamberlain fell through – but not before much posturing. 2 of 16 *

Bettmann Archive/Getty Images JOHN JOHN JABS, 1974 John Kennedy Jr. lands one on Ali’s honker hours before “The Greatest” defeats Joe Frazier in a non-title fight. 3 of 16 * AP Photo ROCKY

ROAD, 1977 Sylvester Stallone (_Rocky_) and Ali (_The Greatest_) clown it up back stage after the Oscars awards. 4 of 16 * The Ring Magazine/Getty Images HEAVY-HANDED, 1978 Olympic Russian

weightlifter Vasily Alexeyev drops the hammer at Ali’s training camp. 5 of 16 * Jerry Watson/Camera Press/Redux DYNAMIC DUO, 1979 Playing a former slave elected to the U.S. Senate, Ali

starred with Kris Kristofferson in the TV miniseries _Freedom Road_. 6 of 16 * Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images “WHAT’CHU TALKIN’ ‘BOUT, ALI?”, 1979 Gary Coleman and Ali,

who made a guest appearance on the TV show _Diff'rent Strokes,_ have fun. 7 of 16 * Reagan Library TAKE ONE FOR THE GIPPER, 1983 President Ronald Reagan gives a poke in the Oval

Office. 8 of 16 * Mark Wilson/Getty Images COMMON CAUSE, 2002 Michael J. Fox and Ali appeal to a Senate subcommittee for more funding to find a cure for Parkinson’s disease, which afflicted

both of them. 9 of 16 * Craig Ambrosio/Getty Images ROCK ON, 2003 Ali and comedian Chris Rock ham it up at the launch party of the book _GOAT: Greatest Of All Time,  A Tribute to Muhammad

Ali_. 10 of 16 * M. Caulfield/WireImage for PMK/HBH/Getty Images SEEING STARS, 2004 Singer Celine Dion lands one during Celebrity Fight Night X, an annual fund-raiser for the Muhammad Ali

Parkinson Research Center at Barrow Neurological Institute. 11 of 16 * Matthew Peyton/Getty Images SPARRING PARTNERS, 2004 Former New York City Mayor Rudolph Giuliani and Ali go at it

backstage during an MTV programming promotion event.   12 of 16 * Amanda Edwards/Getty Images GOOD SPORT, 2005 The Rev. Jesse Jackson takes his turn at the 20th Annual Midsummer Night's

Magic Awards Dinner in Los Angeles. 13 of 16 * M. Caulfield/WireImage for PMK/HBH/Getty Images IN A CLINCH, 2005 Singers Gloria Estefan and Donna Summer mug with Ali at Celebrity Fight

Night XI. 14 of 16 * M. Caulfield/WireImage for PMK/HBH/Getty Images ‘WHY, I OUGHTA … ’ 2006 Robin Williams channels Popeye at Celebrity Fight Night XII. 15 of 16 * Michael Buckner/Getty

Images for Fight Night IN THE KISSER, 2013 Singer Jennifer Lopez throws an uppercut at the 2013 Celebrity Fight Night XIX.  16 of 16 Video: Lonnie Ali on Caregiving The wife of Muhammad Ali

shares the importance of having support, especially a good doctor or specialist. -------------------------