Justin Bieber partied until 5 a.m. at a nightclub in Miami, Florida on Tuesday morning (04.06.13).

The 19-year-old singer, who has an on/off relationship with Selena Gomez, was surrounded by a huge group of girls after arriving at Mansion nightclub for its Hot Excess Mondays hip-hop party at 3.45 a.m. with a huge entourage.

A source told People.com: ''Justin arrived at 3:45 a.m. with three SUVs of friends, including Young Money artist Lil Twist.

''Bieber was surrounded by an ever-growing group of girls, talking to one unknown girl in particular, but also spent time texting and enjoying the music on stage.

''He stayed until the lights came on at 5 a.m., closing Mansion down.''

The group spent the night in the VIP area, where the underage singer sipped water and watched live performances by Rocko, Pleasure P and Flo Rida, who was shouting out at the crowd and celebrating Miami Heat's victory over the Indiana Pacers, which saw them win the NBA's Eastern Conference Finals in Game 7 on Monday evening (03.06.13).

Justin also attended the game.