Chris Pratt -- Forget Jurassic World ... I'm Going to Margaritaville! (VIDEO)

Chris Pratt is living the life -- he's got "Jurassic World" opening this weekend (which is sure to be huge) and now he can say he's performed with the one and only ... Jimmy Buffett.

Buffett was on stage Tuesday night at the "Jurassic World" premiere party in Hollywood ... and when it was time for "Margaritaville" ... Pratt just couldn't resist Jimmy's invite to join in.

Pratt's musical proclivities are no secret ... he's rocked out numerous times on "Parks and Recreation" and who could forget his legendary Eminem rendition?!

It's good to be Chris Pratt.