I'm pretty amazed by the entire list - then again, this is VH1...
I would immediately knock Tom Cruise, the Friends cast, Jerry Seinfeld, Steven Spielberg, Jennifer Lopez, Bill Clinton, The Brady Bunch, Britney Spears - and possibly Oprah Winfrey - out of the top twenty (many of them out of the top 100) and replace them with James Dean, Elizabeth Taylor, JFK, Judy Garland, Frank Sinatra, Walter Cronkite, Grace Kelly, Alfred Hitchcock, and, possibly, Barbra Streisand. I might also replace The Beatles with John Lennon on his own.

Of those mentioned further down the list, I would also move up Charlie Chaplin, Babe Ruth, Audrey Hepburn, Bill Cosby, Paul Newman, Jackie Onassis, Woody Allen, Bette Davis, Johhny Carson, Hugh Hefner, and David Bowie - then I might start
considering some of those I bumped.
I was also astonished to find that, in a list of 200, they didn't even
include Cronkite, Greta Garbo, Albert Einstein, John Glenn, Twiggy, Sidney Poitier, Douglas MacArthur, Farrah Fawcett, Louis Armstrong, Mao Tse-Tung, Milton Berle, Mark Spitz, Buddy Holly, Laurel and Hardy, or - the most recognizable "icon" in the world - Ronald McDonald. Yet they could include Susan Lucci, Bob Denver, Christie Brinkley, and Dr, Phil??