Goldie Hawn takes on Kate Hudson in tennis

They were all dressed up, but that didn't stop them.

Fun-loving Goldie Hawn, 67, and her daughter Kate Hudson, 34, hiked up their skirts and picked up their racquets to play a little tennis at a gala dinner in London Monday night.

But that's what you do when it's a Novak Djokovic Foundation inaugural to supports disadvantaged children, especially in Djokovic's native Serbia.

Kate's partner Matt Bellamy also attended the dinner, but didn't join in the play.

Jeremy Piven was on hand to compete with Djokovic in doing the splits. Gerard Butler, Ron Wood and Princess Beatrice and Eugenie were all smiles at the bash, too.