updated 07/19/2011 AT 10:20 AM ET
•originally published 07/12/2011 AT 6:00 AM ET
Julianne Hough frolicked on Miami Beach – not with beau Ryan Seacrest, but with her mom, Marriann, and her costar, Diego Boneta. The actress, who’s filming Rock of Ages in Florida, enjoyed her downtime, swimming in the ocean and in her condo pool. “Julianne and her mom were having a blast, skipping through the waves, holding hands and enjoying the beautiful summer day,” says a source.