Liza Minnelli and Alan Cumming enjoyed a show after their own show last week, to celebrate Minnelli’s 67th birthday. The pair, who had earlier played to a sold-out house at Town Hall, headed to the Copacabana Club to toast Liza with tall, cross-dressing showgirls and a topless roller girl. Cumming told us of performing with Minnelli, “Can you believe my life? Not bad for a boy from Scotland.” And the “Cabaret” legend, asked how she stays in shape, said, “It’s work that keeps me young.”