The old saying goes "imitation is the sincerest form of flattery" but we're not sure if tennis star Serena Williams will be flattered by Caroline Wozniacki's imitation of her during a recent exhibition match in Brazil.

Wozniacki was facing Maria Sharapova and took a stoppage of play to stuff her top and skirt with towels from the sidelines to make herself curvy like Serena. After Caroline got everything in the right place, she played out the point and won it when Maria hit the ball out of bounds.

We're not sure Serena will find it so humorous. Wozniacki better hope so or SERENA SMASH!