You haven't heard of them yet, but if scores of hysterical teenage girls in chat rooms are a gauge of the future, you're looking at the next Brad, Heath, Jake, and Ewan. A former Bruce Weber model and still a singer for the rock band Tribe, Steven Strait will star in Roland Emmerich's 10,000 B.C., a chest-baring spectacle about prehistoric man. Channing Tatum (also a former Bruce Weber model) impressed viewers and critics in the indie hit A Guide to Recognizing Your Saints. He'll soon be seen in Stop Loss, Kimberly Peirce's first film since Boys Don't Cry (1999), as part of a hot-young-actor cast that includes Ryan Phillippe. Before that, catch Tatum in Battle in Seattle, with Charlize Theron. London-born Charlie Cox was rigorously trained as an actor at Sherborne School, in Dorset, England, paving the way for a pair of high-profile costume dramas: The Merchant of Venice, with Al Pacino, and Casanova, with Heath Ledger. The young hero is currently starring in Stardust, with Michelle Pfeiffer, Claire Danes, and Robert De Niro. Zac Efron, whose musical-theater background and dreamboat positive energy helped make the television show High School Musical something of a cult phenomenon among teens, is now part of this summer's feel-good camp extravaganza, Hairspray.