Joe Jonas in Las Vegas
got a jumpstart on his 22nd birthday celebrations in Las Vegas – in a big way.
Starting off Saturday, Jonas, whose actual birthday is Aug. 15, caused a splash at Liquid Pool Lounge when he spent the afternoon poolside in a VIP cabana with pals.
"Female fans surrounded the area, trying to get a glimpse of [Joe] in his bathing suit," a source tells PEOPLE.
Following his fun in the sun, Jonas and his entourage then headed to the Bellagio Hotel where they were treated to a meal from Akira Back, the executive chef at Yellowtail Japanese Restaurant & Lounge.
After dinner, Jonas and friends made a quick stop at Deuce Lounge, where they played blackjack – and drew another crowd.
"Joe was swarmed by nearly 20 female fans dying to get an autograph or photo with [him]," the source says. "After signing a few autographs and meeting with fans, Joe finally made it to Haze Nightclub where he rocked the crowd with a special live set, performing tracks off of his debut solo album FastLife
"It's a coming-of-age record," Jonas told PEOPLE at the event. "I want to present it to people my age – a little bit older."
The performance, which ended at around 2:30 a.m., left Jonas, who will soon join Britney Spears on her European tour
, in the VIP area where he was "chatting with a bevy of beautiful girls." He also received a special keyboard-shaped birthday cake.
"Girls were pushing to get near him," another source says. "He was definitely loving the attention."
Reporting by JENNIFER GARCIA and MARK GRAY