Will.i.am & Psy COLLABORATE ... For Sushi

7/25/2013 8:00 AM PDT

Will.i.am & Psy -- COLLABORATE ... For Sushi

It was a meeting of the pop megastars at Katsuya in Hollywood last night ... when Will.i.am and Psy hooked up for some raw fish -- one month after hitting the recording studio together.

The two arrived to the restaurant in separate cars -- Psy had a driver ... and Will had his $700k custom-made metallic blue monstrosity.

Just last month, Psy teased a possible collaboration when he posted a photo of the two in a recording studio with the caption -- "Some cool sh**z goin on in London at 2am!! Me& @iamwill !! Guess what!?"

Neither one of the stars mentioned anything about releasing a song in the near future when they emerged last night -- but the scene in front of the restaurant felt like a media event, with Will and Psy posing together for the legions of paps.