Kate Beckinsale's Man Grabs Hold of Her Underworld

Kate Beckinsale's backside was unveiled ... in the firm grip of husband Len Wiseman!

Kate Beckinsale & Len Wiseman
Len derailed Beckinsale's tush at the "Live Free or Die Hard" premiere after-party, grabbing a handful of booty as the two got physical on the dance floor. One-and-two-and squeeeeeeeeeeze!