Just a few nights after Jimmy Fallon and The Roots stole the show with a guest appearance on U2's e-stage, another special guest did it Sunday night at the fifth of eight shows at Madison Square Garden. But unlike Fallon, who hid behind a sign last week, this special guest -- none other than Lady Gaga! -- had very little of anything to hide behind. And if you don't know what that's a reference to, just watch the video below.

As always, you can get the full New York #5 setlist on @U2 Tours, and that's where you can upload your photos and post a review if you were there. (I think we somehow managed to skip the New York #4 setlist a few nights ago, but that's obviously available, too.)

Next up? New York #6 on Monday night!

And meanwhile, here's video of Sunday's special guest performing with U2.