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.)

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.