A rock star is someone who can light up a crowded room just by walking in.

Last night, the answer to that question was Mr. President Mr. Former President, to be exact.

(For details on the all-new music that Fallons working on, checkEW.coms exclusive news story.)

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When he finally ascended to the podium to make his own speech, the room erupted in cheers.

U2 has been particularly good to me, Clinton said.

(Hes a fan?

Sorry to interrupt, Denis Leary offered ashe darted eagerly between the pair.

Josh Hartnett came over to shakeBills hand, too.

Its like meeting the pope or something, he gushedto me a few minutes later.