Joe Jonas

Courtesy of Denise Truscello/WireImage

Joe Jonas' solo album doesn't release until Oct. 11, but the singer did some other stuff sans-brothers this weekend: Ringing in his birthday in Las Vegas.

The middle JoBro actually turns the big 22 today, but he started celebrating with friends on Saturday in Sin City.

First up was a daytime poolside soiree at Liquid Pool where girls were eager to get a glimpse of him sans shirt, followed by dinner, gambling, performing and more partying:

After changing into an Armani Exchange ensemble and dining at Yellowtail Restaurant, Joe stopped at Deuce Lounge inside Aria resort to play a few rounds of blackjack. No word if he won, but he certainly scored some attention. "He was swarmed by nearly 20 female fans dying to get an autograph or photo," a source says.

It was a late night for Joe, who didn't even walk the red carpet at Haze nightclub until 12:45 a.m.!

Then he performed songs from his upcoming album FastLife, before scoring a surprise piano-shaped cake around 2:30 a.m. According to eyewitnesses, Joe chatted up a bevy of babes at his VIP table.

Eat your heart out, Ashley Greene!

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