50 Cent's Baby Mama: A Rear Beauty

Daphne Joy -- best know for this, and being 50 Cent's baby mama -- is a sight to behold from almost every angle you can imagine ... but especially from behind.

Daphne's got a 3-year-old kid with 50 Cent and is rumored to be dating Jason Derulo now. She pretty much gave away the secret to her dating success on the beach in Miami.

Fiddy must love watching her leave.