Justin Bieber celebrates 21st birthday on private island

Justin Bieber rang in his 21st birthday by partying with friends on a private island in the Caribbean on Saturday night (28Feb15).

The Baby hitmaker rang in the milestone birthday on Sunday (01Mar15) in a house on an island near Grenada, according to TMZ.com, and he shared a video showing himself dancing shirtless to 50 Cent's hit In Da Club, holding what appears to be a bottle of Champagne, as his pals hold up sparklers around him.

The pop star later shared pictures of the party on Shots.com, uploading a number of black-and-white photos of himself with friends including model Yovanna Ventura, who is seen giving the birthday boy a kiss on the cheek.

Bieber's longtime friend model Hailey Baldwin was also on hand for the party, which raged until the early hours of Sunday (01Mar15), and the singer later took to Twitter.com to write, "Grateful to be alive!!!... I love everybody!"