Maksim & Karina Exes Forced to Bump & Grind

9/21/2009 7:55 AM PDT
Definition of AWKWARD: heartbroken Maksim Chmerkovskiy forced to perform in an extremely sexually charged dance routine with his ex-fiancee ... just days after Karina Smirnoff broke his heart.

We're guessing they agreed to perform their steamy Emmy number before they called off their engagement -- 'cause the amount of touching, thrusting and inner-thigh grabbing Maksim had to pull off with his ex ... could only have made him even sadder....