PHOTOS: John Mayer Makes Colorful Music in London

It's a John Mayer rainbow! The singer/songwriter/lover-of-famous-women performed live at The Hard Rock Cafe on Old Park Lane on Monday in London... and his concert was extremely colorful! John sure knew how to set a seductive mood for his show, with spotlights in every color shining on him during his set — we find the purple version of John to be quite lovely!

EXCLUSIVELY IN THE PAGES OF OK! — ON SALE EVERYWHERE NOW — KIM KARDASHIAN SHARES HER SECRETS FOR GETTING THIN AND STAYING IN SHAPE!

Also in this issue:

• Trouble in Paradise for Britney Spears

• Inside Robert Pattinson and Kristen Stewart's Romantic Getaway

• Jersey Shore's Snooki ditches the high hair and gets an amazing make-under!

• Kendra Wilkinson's family photos of newborn baby Hank

...and all the latest news, gossip and photos!