Happy birthday, Jay-Z! The legendary rapper, who became a mogul who became a Brooklyn Nets partial owner who became a sports agent, turns 44 today. After bursting onto the hip-hop scene in 1996 with his debut album “Reasonable Doubt,” Hova has been a music-industry staple ever since. After selling his share in the Nets in April, Beyonce’s husband launched Roc Nation Sports. The sports management firm represents stars Skylar Diggins, Kevin Durant, Victor Cruz and Robinson Cano. It also represents Geno Smith. Further demonstrating his love for sports and entertainment, Jay-Z was an executive producer on NBA 2K13. And getting back to this whole birthday thing, time will tell if Jay-Z is as good at receiving as he is at giving. Back in May, on her graduation day from Notre Dame, Diggins became the proud owner of a new Mercedes, courtesy of Roc Nation.