Justin Bieber cries in Miami jailhouse. Singer released on $2,500 bail.

Justin Bieber was released from a Miami jail on Thursday afternoon following his arrest hours earlier for DUI, driving with an expired license and resisting arrest.

As he walked out of the Turner Guilford Knight Correctional Center surrounded by police, Justin Bieber, 19, climbed atop his waiting SUV, sat down and waved to fans while putting on a brave face.

Clad in a black hoodie, sunglasses and the same baggy leather shorts he was wearing when he was busted for allegedly drag-racing in the wee hours of Thursday morning, Justin Bieber tried to look as unaffected as possible by the incident by acknowledging the looky-loos waiting outside the jail.

Justin Bieber’s swagger-laden stance upon his release echoed his smiley mugshot and reported bad attitude with the arresting officers. He reportedly asked one: “Why the **** are you doing this?”

But behind the scenes, it was apparently a different story.

According to People magazine, after a judge set his bond for $2,500 via a video link from jail, Justin Bieber broke down.

Wearing a red jail jumpsuit with the sleeves rolled up far enough to show off his tattoos, Justin Bieber was “crying his eyes out,” says a source.