Party people at Vegas' Bank Nightclub in the Bellagio Resort & Casino got a special treat Friday night!
Bruno Mars rocked the crowd at the packed nightclub performing his big hits like Grenade and The Lazy Song.
Insiders tell us the crowed was having a great time, singing along and waving their lighters from side to side.
Later, he was shocked when he got this awesome cake shaped like an old-school microphone (as pictured above).
He stayed with his friends, partying it up, until 3am. Then, he went back up to his VIP suite, and maybe had a little bit of post-party fun??
[Image via Wire Image.]