Katie got onstage with her man Wednesday night at Paramount Studios -- and at least for these few moments ... couldn't keep their hands off each other. The couple's been together for four years, but TMZ only seen PDA shots once before. Normally, they avoid all public photos or video.
Pretty fitting Jamie was whispering sweet nothings to Katie while JAY-Z's "Excuse Me Miss" was blaring. Nicely done, Jamie.
See the video here.