Happy birthday Justin Bieber!

The "Boyfriend" singer turns 19 years old today.  It seems like just yesterday he had that infamous haircut, and it's hard to forget he's not a "baby" anymore.

We dug deep into all the "selfies" on Justin's Instagram and picked out the sexiest ones to remind us he's all grown up.

From shirtless pictures showing off his toned six-pack and biceps, close ups of his incredibly defined jawline (and those lips...), and candids of the family man, it's hard to not swoon over the hot...single...singer.

With over 7 million followers on Instagram, Justin sure knows how to tease his fans while still leaving a little to the imagination. Click the "Launch Gallery" above to see 19 of Justin's sexiest pictures!

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