AceShowbiz -

Sunday, September 15 was a rest day for many but not for pop/dance diva Jennifer Lopez, who headed inside a Hollywood recording studio to work with a new track collaborator, man of the hour Robin Thicke. The returning "American Idol" judge and the "Blurred Lines" singer were snapped in a photo potentially making the next big hit.

The snapshot had the two chart-toppers with their backs towards the camera, facing the recording consoles with their right arms raised. Lopez was dressed in a bohemian-inspired summer dress while Thicke wore a plain blue shirt over a pair of pants in a darker shade.

J.Lo's sister Lynda, who came along with the 44-year-old entertainer that day, revealed the new collaboration by posting the photo on Twitter. She captioned it with, "Uh oh...walked into the studio to find this: @JLo @robinthicke ...can't be nothing but trouble... :)."

Another person close to J.Lo also revealing her other new collaborator was boyfriend Casper Smart. He dropped a photo of him and his sexy girlfriend with G.O.O.D. Music label rapper Big Sean on Twitter.

"Me n young @Jlo! Her n @beaucaspersmart are the homies. Luv to em both...," likewise wrote the "10 2 10" artist. J.Lo was wearing the same pattern halter sundress she wore while recording with Thicke but in a different color palette, wearing almost no make-up as Big Sean wrapped his right arm around her.