Jessica Biel: Nuts About Justin

With her buff bod and no-frills attitude, Jessica Biel is Hollywood's sexiest tomboy, and she certainly acted like one of the guys while shooting Nailed with Jake Gyllenhaal.

The actress, 26, who's been filming in South Carolina recently told Jake, 27, that she missed beau Justin Timberlake, 27, and she complained that they can't get together because of their schedules.

A set insder tells OK!, "Jessica was wearing a vintahe dress with pom-poms lining her collar. Jake asked, 'What are these?' Jessica joked, 'These are Justin's balls. I want them near my heart.'"

So ladylike, Jess!