Katy Perry has ever changing hairstyles and here are some favorites:
She has a vintage wavy shoulder length bob in a pink shade here at the MTV Music Awards. She has a record accessory like a tam hat placed toward the front of her head. The style is reminiscent of a Lauren Bacall's 1940's hairstyle.
This super straight and choppy inverted bob is from December of 2011. She has a side part and no bangs. The color is blonde with pink highlights.
Here she is in 2012 with a similar bob but this one is blue.
And then later in 2012 at the Billboard Music Awards she is sporting a dark hair color more like her own with a dusting of purple highlights that just add a shimmer and match her dress. This is a soft and glamorous style with soft curls that cascade down over her shoulders.
This one is a simple updo bun in her natural color.
It's Fashion Week 2011 and her straight long blue hair with short bangs is reminiscent of the 60's styles. She has round glasses and a striped shirt.
Paris Fashion Week 2012 she has blue bob and fedora hat that sits back on the crown. A little bit like Boy George perhaps?
2011 Pre-Grammy Gala she has super straight and sleek sedu hair that is parted in the middle. A flat iron helps with the smooth shine.
Europe MTV Music Awards 2011 where she is wearing Bettie Page rolled bangs and a partial updo. Her pink hair matches her pink leather studded jacket.