Naughty boy! Shirtless Jason Derulo puts his arms around two bikini-clad women in Las Vegas... as girlfriend Jordin Sparks is miles away in LA

While Jordin was away, Jason played... with female admirers.

On Saturday, the 24-year-old singer flexed his muscles at Rehab Pool And Dayclub at the Hard Rock Hotel in Las Vegas where he performed shirtless as he DJ'd for many bikini-clad fans.

Meanwhile, his American Idol girlfriend Sparks was spotted hundreds of miles away at Los Angeles International Airport that same day.

Flying solo: Jason Derulo partied in Las Vegas with bikini clad female fans at Rehab Pool and Dayclub in Las Vegas, Nevada on Saturday

Flying solo: Jason Derulo partied in Las Vegas with bikini clad female fans at Rehab Pool and Dayclub in Las Vegas, Nevada on Saturday

Dirty dancing: The singer moved to the tunes with a bikini clad looker

Dirty dancing: The singer moved to the tunes with a bikini clad looker

Not holding back: The Stupid Love hit maker flashed his Ralph Lauren underwear and wore a gold chain

Not holding back: The Stupid Love hit maker flashed his Ralph Lauren underwear and wore a gold chain

Does she know?: Jordin Sparks touched down in LA on Friday

Does she know?: Jordin Sparks touched down in LA on Friday

The two lovebirds - who are usually inseparable - enjoyed the weekend without each other.

Jason soaked up the Las Vegas sun at the event sans shirt showing off his thick gold chain, Polo Ralph Lauren underwear and Louis Vuitton checkered belt during his performance.

Jordin looked makeup-free as she was spotted leaving the airport in LA.

She was covered up in a grey jacket and top, denim skinny jeans, black sandals and matching sun hat.

Jason served as the in house deejay and performer where he played his own tracks including his chart topping hit, Wiggle.

The track featuring Snoop Dogg invited several ladies onto the stage where they demonstrated their dancing skills wiggling their backsides along with Jason during the appearance.

Derulo – born Desrouleaux – also posed shirtless for pictures with two fans dressed in itsy bitsy bikinis at the legendary Las Vegas pool.

Before he was surrounded by dancers and female fans, the Talk Dirty To Me singer covered up for the red carpet wearing a bright orange ensemble that included a Nike tank top with black shorts, socks and matching Air Jordan sneakers.

He seemed to be in great spirits.

He topped his look with a black and orange Jordan brand cap for a two-toned outfit ahead of his shirtless performance.

He wants peace: The Stupid Love singer flashed a sign as he stood on the carpet of Rehab in Las Vegas on Sunday

He wants peace: The Stupid Love singer flashed a sign as he stood on the carpet of Rehab in Las Vegas on Sunday

Hat's off to him: The star caused a scene at the event, but he may have a few questions to answer to his partner
Hat's off to him: The star caused a scene at the event, but he may have a few questions to answer to his partner

Hat's off to him: The star caused a scene at the event, but he may have to answer a few questions from his lady love Jordin

On July 15, the R&B crooner alerted fans via Twitter that he suffered a medical injury, posting a snap of him inside the doctor’s office.

‘So I broke a rib playin’ b-ball yesterday! Got undercut while goin in 4 a lay-up #notagain #wtf,’ Jason commented from the hospital wearing a medical robe and unhappy grin on his face.

In 2012, Jason endured a neck injury that caused him to cancel his world tour.

What a cute couple: The singers at Summer Sessions in LA on July 11

What a cute couple: The singers at Summer Sessions in LA on July 11