Katy Perry: Wild West Birthday Ho Down Throwdown!

Katy Perry dresses up as a sexy cowgirl and rides a mechanical bull for her Wild West Birthday Ho Down Throwdown on Friday (November 11) in Los Angeles.

The 27-year-old pop superstar (in Jeremy Scott) celebrated her belated birthday with comedian husband Russell Brand, who dressed up as an Indian.

“I like all my friends to have a good time,” Katy shared of her all-out birthday bash. “I want them to have an experience.”

Earlier today, JustJared.com posted saloon photo booth pics and details from the ho down throwdown.

Party guests pictured here: Adam Lambert and boyfriend Sauli Koskinen, Chuck‘s Zachary Levi, Kyle XY‘s Matt Dallas and musician Blue Hamilton, Abduction‘s Will Peltz and Just Jared‘s Jared Eng, Anna Faris and husband Chris Pratt, Robyn, stylist Johnny Wujek, and designer Markus Molinari getting a lap dance.

FYI: Katy‘s actual birthday was October 25 – she celebrated with a few friends at London’s Electric Cinema, where guests were treated to a showing of the cult classic Ghostbusters.

35+ pictures inside of Katy Perry‘s Wild West Birthday Ho Down Throwdown…