Rapper 50 Cent's baby's mama DAPHNE JOY was spotted frolicking on the beach in Mexico. She had been with her new BF Jason Derulo earlier in the week. But yesterday she was all by herself. And goodness, her body looked MAGNIFICENT . . . Daphne and 50 Cent welcomed their son Sire into the world in September 2012. Just like his daddy, he's becoming a powerful force in the industry -- he "signed" his first modeling contract last Spring. Proud papa was front row and center to watch his son make his way (with mom) down the runway in the Isabella Couture Fashion show during Los Angeles Fashion Week.