Elton, Paul and Rod

Rod "the mod" and Paul McCartney shared the stage at the "Party at the Palace" concert in 2002. Rod shares the microphone with Ozzy Osbourne and Paul with Cliff Richard.

"Artist Direct" and lots of other sources including U.K. tabloid "The Sun" informs us that Elton John, Paul McCartney and Rod Stewart will headline a special concert celebrating the 70th anniversary of Victory in Europe Day, aka VE Day. The gig will be 1940s-themed and it will commemorate the end of the Second World War in 1945. It will be held at London's Horse Guards Parade on May 9.
No doubt, Paul and Rod will be crooning songs from the fourties from Rod's "The Great American Songbook" album series and Paul's "Kisses on the Bottom" album. Paul and Rod acted as "best men" at Ronnie Wood's wedding in 2012.
The wartime singer Dame Vera Lynn (97) will also appear during the event, which will broadcast live in the U.K.
VE Day will be marked over the course of the three days in May, with parades and shows being held in the streets. The gig will be in between Paul's concert in Seoul, South Korea on May 2 and his concert at London's O2 on May 23.

Source: ArtistDirect.com