KEVIN DILLON, 39
Plays: washed-up actor Johnny Drama
On living his role: "I started out in this business doing a lot of movies [Platoon, The Doors], and then I couldn't get an audition. I came real close on NYPD Blue, but the role went to Rick Schroder."
Summer plans: filming a remake of The Poseidon Adventure.
KEVIN CONNOLLY, 31
Plays: budding Hollywood player Eric
On girlfriend Nicky Hilton: "People would be disappointed in the normalcy of our relationship. We watch Desperate Housewives and fall asleep."
Summer plans: He's directing his first feature film—a dark comedy titled The Gardener of Eden.
JERRY FERRARA, 25
Plays: full-time mooch Turtle
A Cinderella story: This Brooklyn boy shares his character's kid-in-a-candy-shop view of Hollywood. "It's a dream to have a steady job at all. But to get this job...wow. I'm a fairy tale."
Fave perk of fame: "There's a gas truck on-set, so I never have to buy gas."
ADRIAN GRENIER, 29
Plays: movie star Vincent Chase
How Entourage changed his life: "L.A felt lonely," says the New Yorker. "But now I can go anywhere and talk to anyone. You get a good look at the power celebrity carries."
Summer plans: jamming with his bands the Honey Brothers and Kid Friendly.
JEREMY PIVEN, 39
Plays: super agent Ari Gold
How his character operates: "He's an assassin and a child. He will kill you but do it with the enthusiasm of a toddler. I tap into that rich and authentic world." His best real-life deal-making: persuading Bono to guest star (on the July 31 episode). "I've been a U2 fan forever," he says.