Feast your eyes on this, ladies! Kellan Lutz showed off his muscles and super hot bod while vacationing on the beach with girlfriend Sharni Vinson Tuesday.

The couple is currently enjoying time in Miami, Florida together, and spent the day splashing in the ocean and lounging on the beach. Meanwhile, Kellan's fitness loving lady doesnt look to shabby in her bikini, either -- click through the gallery to check out the super hot pictures!

Sharni Vinson and Kellan Lutz Have a Day at the Beach

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Kellan and Sharni began dating last September, after he ended a pretty serious relationship with AnnaLynne McCord. Things seem to be moving in that direction with he and Sharni, especially considering how close they seem to be on this latest endeavor!

How long do you think Kellan and Sharni will last?!

Photos Courtesy of: Fame/Flynet