Katy PerryKaty Perry busted out her infamous blue wig and colorful jumpsuits last night for a sold-out show at the Hammersmith Apollo in London. The 'Firework' singer put on quite a show, fully equipped with a cupcake dress and glitter explosion.

Perry is on the European leg of her 'California Dreams' tour. Having spent much of last month all over Europe, she will find some stability in hubby Russell Brand's homeland, playing shows in the U.K. through April.

Join us as we take a trip down memory lane and see some of Katy's most fabulous onstage looks.