Sean “Diddy” Combs turned the big 4-0 with a black-tie celebration at the ritzy Plaza Hotel in New York City on Thursday (Nov. 19). The star-studded event drew the likes of Jay-Z, Bono, Young Jeezy, Nelly, Estelle, Cassie, Rick Ross, Lupe Fiasco, Martha Stewart, and Kim Kardashian. Trey Songz and the legendary Al Green performed for the birthday boy.