John Mayer Rocks London, Sings for Haitian Relief

Busy touring away in Europe, John Mayer hit the stage at HMV Hammersmith Apollo in London, England on Monday night (January 18).

The "Gravity" singer churned out all of the hits for a packed crowd, now heading off to Wolverhampton for a gig on Tuesday night before heading back to the States.

Prior to his HMV Hammersmith Apollo Show, John was busy doing his part for the Haiti relief effort.

He tweeted, "Just recorded my song for CNN's "Haiti: How You Can Help" special, tonight at 8pm EST. Made with lots of love and hope."

Joking around, Mayer later chimed in on "American Idol," tweeting, "I'm not saying I don't like watching Idol auditions, I just have to watch 30 minutes of Marvin Gaye live videos directly after."

Celebrity Gossip

Enjoy the pictures of John Mayer performing live in concert at HMV Hammersmith Apollo (January 18).