Sean Kingston shows off his cake as he celebrates the release of his new album, “Tomorrow,” at TENJUNE nightclub in NYC on Wednesday night (September 23).

The 19-year-old rapper partied with pals Rick Ross, Lil Jon and Russell Simmons at the party. Sean also performed three tracks including “Beautiful Girls,” from his freshman album.

Sean‘s “Tomorrow” is available everywhere NOW — sample all the tracks at Amazon.com!

Pics also include Sean making his mark at NYC’s Planet Hollywood and performing at the 2009 ALMA Awards. 15+ pics inside…