Although, if we're being honest, it's all of them.
Former Xena: Warrior Princess star Lucy Lawless is returning to her action TV roots by joining the cast of Marvel's Agents Of S.h.i.e.l.d..
Former Kyuss frontman John Garcia was stunned when his hero Robby Krieger agreed to play guitar on a track on his new self-titled solo album.
Action man Dwayne Johnson spent more than three hours in the make-up chair every day, having the hair from a yak's testicles carefully stuck to his face for his new role as Greek demigod Hercules.
Richard Pryor's son has threatened legal action in a bid to block production on Lee Daniels' new movie about the famous funnyman.
Mark Ruffalo's faith in the goodwill of strangers has been restored after a Good Samaritan reached out to him upon finding the actor's lost wallet.
Action man Dwayne Johnson had to get up at 3.30 ever morning to hit the gym and gobble up steak and egg whites to maintain his impressive physique for new movie Hercules.
Dan Aykroyd has added his tribute to late friend and co-star James Garner, branding him a "first class actor and man".
British pop star Elly Jackson has taken aim at Kanye West, insisting he is despised by almost everyone in the music industry.
Ed Sheeran's X has become the U.K.'s longest-running number one of the year (14) after fending off a charge from Morrissey to stay on top of the album charts for a fourth week.
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The 25 movies that started trends and gave us looks with staying power.
Forget Demi and Ashton. These celebrity spouses have some major age differences.