Britney and Charlie started dating in November, shortly after the "Toxic" singer broke up with her ex-boyfriend David Lucado, who she's openly accused of cheating on her
. Ebersol is the son of former NBC Sports chief Dick Ebersol, and besides co-founding The Company -- an entertainment business that creates TV shows like USA's The Moment
and TNT's The Great Escape
-- he's also a filmmaker, which would explain Britney's extravagantly decorated cake.