Kate Beckinsale -- Two Can Play the Single Game

With estranged hubby Len Wiseman strolling around town without his wedding ring, the beautiful Kate Beckinsale did the same Sunday night at the Evening Standard Theatre Awards in London.

Kate flaunted a naked ring finger and looked anything but heartbroken.

As TMZ reported, Wiseman has been spotted around town with a very young model, CJ Franco.

Kate and Len married in 2004 ... so far there's been no official word on a divorce.