Vedder becomes A King

Let's see here,
My new favorite band playing with a guest spot by my all-time favorite bands lead singer...as they both open up for another legendary band...wow


EDDIE VEDDER BECOMES A KING!
KINGS OF LEON were joined by a very special guest last night (April 25).
The band were playing Seattle’s Key Arena supporting U2 on the North American leg of the ’Vertigo’ world tour.
During a highly charged setlist comprising of tracks taken from both ’Youth And Young Manhood’ and ’A-Ha Shake Heartbreak’, Kings Of Leon were joined by Pearl Jam’s Eddie Vedder on vocals for the track ’Slow Night, So Long’.
Kings Of Leon will continue to support U2 on the first leg of the ’Vertigo’ jaunt until it wraps up at Boston’s Fleet Center on May 28.

Here is the story via U2's homepage

After the success of first night in Seattle u2 hosted a fantastic party. All of the band were there, along with Bill Gates The Killers and Eddie Vedder and Stone Gossard from Pearl Jam.Before the end of the night The Kings of Leon also showed up and obviously they and Pearl Jam hit it off.As U2.com can report, a wonderful night was had by all and it lead on to a tremendous musical moment for fans at the second show.As The Kings of Leon were playing through their set, Eddie Vedder joined the young rockers from Tennessee on stage during their final track Slow Night, So Long to a huge cheer from the local audience.A long time fan of the band - Eddie turned up to sound check for the second show with tambourines at the ready.Slow night is reportedly Vedder's favourite song by the Kings. He perhaps smashed 3 or 4 Tambourines - tossing them out into the audience - all the while getting down with the Kings and looked to be loving every minute of it.