Zac Efron sipped a cold drink while he hung out with friends in Malibu yesterday. Zac Efron was shirtless again after hitting the sand sans top with Ashley Tisdale on Saturday. He was helping Ashley celebrate her 26th birthday, and the former High School Musical costars got playful in the water during the party. Zac's Fourth of July fun also included his male friends, since he was spotted chatting with Brody Jenner and other pals around the holiday. It doesn't look like Brody's girlfriend, Avril Lavigne, was on hand for the bash, but she had her own fun in the sun in St. Tropez last month.