By Breaking Celebrity News Staff

Julianne Hough and Ashley Tisdale were jet ski buddies on Saturday, and Breaking Celebrity News has hottest pictures of the girls in their itsy bitsy bikinis.

Julianne is in Miami shooting Rock of Ages with Tom Cruise and Russell Brand, and she was joined for some fun by Ashley and her brother, Dancing with the Stars pro Derek Hough.

The threesome were out on the jet skis for hours, with the Hough sibs looking almost like pros on the water.