Witherspoon, who looked stunning in a purple and white ombre dress, let loose to “I Will Survive.” She can be seen whipping her hair, pointing up to the sky, jumping up and down, and even swinging an imaginary lasso.
Watch the video!
The festivities took place at Taverna Anema e Core in Capri on Wednesday.
Musician Guido Lembo, who performed at the party, told Us Weekly, "Reese was beautiful, natural, down to earth. She danced and sang Johnny Cash songs. She is very friendly, very easygoing."