HILARY SWANK,DJIMON HOUNSOU and more of CALVIN KLEIN Underwear's hottest star bods celebrated the venerable brand's 25th anniversary last night in New York.

"My very, very first campaign I ever did was with Calvin," Hilary says. "When I'm 80, I can look back and say, 'Hey! See?'"

They also launched the new Calvin Klein Steel line, featuring boxers, briefs and trunks, which Djimon is modeling. Among the guests were former six-pack abbers and models ANTONIO SABATO JR., MICHAEL BERGIN, JOEL WEST and TOM HINTNAUS.