mel brooks
Charlize Theron
The cast of How to Bake It in Hollywood - 2013 includes: Steelo Brim as Guest Star Meghan Camarena as Guest Star Chelsea Chanel Dudley as Celebrity Guest Echo Kellum as Guest Star Kathryn McCormick as Herself - Celebrity Guest Tammin Sursok as Herself - Celebrity Guest
mel brooks
Of those four, Mel Brooks has not been on Friends.
Ben Affleck
Tony Bennet
Yes, She won a match against Missy Elliott in the 4th season.
Bridget Marquardt is best known for staring in The Girls Next Door. She was on that show for five seasons and has also appeared as a guest in Curb Your Enthusiasm and Celebrity Paranormal Project.
Dynasty
Jaleel White, in the role of Steve Urkel, was the guest star character that appeared in the Dance episode of Step by Step.
There have been 37 guest star on friends. For a list f names, check up http://www.knowledgerush.com/kr/encyclopedia/List_of_guest_stars_on_Friends/
Emily Osment's first show was a guest star on Friends.