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Robert Pattinson, Hugh Jackman

Jun Sato/ Getty Images; Michael Yada/ABC

Robert Pattinson was a first-time Oscar presenter on Sunday. Hugh Jackman was a first-time host.

So, how'd the two first-timers celebrate?

Maybe with a little karaoke.

I just got word that Pattinson and Jackman engaged in some karaoke crooning together this week at a bar in Tokyo.

The two have been in Japan on business. Pattison touched down on Tuesday to promote Twilight while Jackman and Nicole Kidman attended last night's premiere of Australia.

Says a source, "They went after doing press for their films."

Details are still trickling in, but I'm told Australia director Baz Luhrmann joined them, too.