Courteney Cox is an American actress, best known for her roles as Monica Geller on Friends, Gale Weathers in horror series Scream, and Jules Cobb in Cougar Town.

David Coulthard, MBE, is a British former Formula One racing driver from Scotland.

Talent judge @SimonCowell of shows such as Pop Idol, The X Factor, Britain’s Got Talent & American Idol is now officially on Twitter.

Gary Barlow is an English singer-songwriter, pianist, record producer and current X Factor judge.

Samuel L. Jackson is an American film and television actor and film producer.

Zach Braff is an American actor, producer and director, who first became known for his role as Dr. “JD” Dorian on Scrubs.

Mayim Bialik is an actress who played Blossom Russo in Blossom and currently as Amy Farrah Fowler in The Big Bang Theory.

Kevin Bacon is an American actor whose notable roles include Footloose, Flatliners, Wild Things, A Few Good Men, Tremors and Mystic River, amongst many others.

Kaley Cuoco is an American actress best known for her roles as Bridget in 8 Simple Rules and most recently as Penny on The Big Bang Theory.

Tulisa Contostavlos is a British singer-songwriter and will be a judge in The X Factor.