Jason Derulo & Daphne Joy Hardcore Beach Bums

EXCLUSIVE

0309_jason_derulo_daphne_joy_beach_launchJason Derulo and Daphne Joy did their own version of "Baywatch" ... flaunting their ridiculous bodies while vacationing in Mexico.

The couple hopped on an ATV, tried their hands at surfing and frolicked on the sand outside Casa Aramara, Joe Francis' celeb-friendly estate in Punta Mita.

Based on these pics ... it's a safe bet Daphne also took Jason for a ride.