Credit: Jason Merritt / Getty Images Photo: Katy Perry Debuted a New Haircut at the Change Begins Within Benefit on Dec. 3, 2011 in Los Angeles

Katy Perry changes hairstyles faster than her songs climb the Billboard charts.

While most of her 'dos are a little too outrageous for our taste, she really impressed us when she arrived at the Change Begins Within benefit on December 3, 2011 with a more subdued face-framing bob.

Katy, who wore a studded Versace dress, was all smiles as she walked the red carpet arm-in-arm with hubby Russell Brand. Guess frequent makeovers are the key to a strong marriage!