Penelope Cruz Takes Over U2 Concert ... It's My Stage Now!!

Penelope Cruz is still hot enough to get U2 to play an entire concert ... JUST FOR HER -- at least that's what 24,000 people must have thought was happening in Barcelona.

Bono and co. played to a packed arena there this week, and when they made the mistake of inviting Penelope and hubby Javier Bardem on stage -- chica snapped pic after pic after pic as the band played on. She even had the lads pose for shots with Javier!

Imagine ... you pay through the nose to see 4 old Irish dudes rock out, and instead you end up with Penelope's bunny-ears-sporting-ass in your face.

Actually ...