Watch Out A-Rod! Justin Theroux Has The Hots For Jennifer Lopez

Serial dater Justin Theroux has the major hots for Jennifer Lopez, RadarOnline.com has exclusively learned. And sources are forecasting fireworks when Alex Rodriguez finds out!

“Justin’s got it in his head that he and J.Lo shared a moment back when he was with Jennifer Aniston and he wants to test the waters by asking her out.”

Theroux, 46, began his playful flirtations with Lopez, 49, at the 2015 Oscars, when he and then fiancée Aniston photobombed “Jenny from the Block” inside the Dolby Theater.

“Photo bombed by my favorite couple Jennifer and Justin,” Lopez shared on Instagram.

The fact that the World of Dance judge is currently dating former baseball slugger Rodriguez only makes Theroux want her more!

“It doesn’t bother him that she’s serious with A-Rod, in fact he sees that as a challenge,” the insider confessed. “The guy’s ego is off the charts, especially after all the success he’s had lately with hotties like Emma Stone and Sienna Miller.”

Indeed, things looked to be heating up between the The Leftovers star and Stone, 29, especially after the two were spotted together on a French vacation!

And there’s always the lingering chance that Theroux and Aniston, 49, may rekindle their romance. But JLo may prove to be his biggest high.

For Justin, Jennifer would be the ultimate conquest – but he’s asking for major trouble with A-Rod,” the insider warned. “He’ll sure as hell kick Justin’s butt if he makes a move.”