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After filming some hot and heavy lip-locking scenes in the ocean with costar Diego Boneta, Rock of Ages hottie Julianne Hough hit the boardwalk on her rollerblades. Wow ... her beau, Ryan Seacrest, is the luckiest guy on the planet!

Rock of Ages, also starring Tom Cruise, has been filming in Miami for the past week. The 22-year-old actress is dressing in some of the most iconic 80's wardrobe ... including jean shorts, crop top and fluorescent accents. Love the Slurpee!

See her sexy costar Diego Boneta ... after the jump.