Katy Perry went all out for her 27th birthday -- she threw herself a Wild West themed party! Katy and husband Russell Brand partied throughout the night at the Los Angeles party, and got into the spirit of things with some amazing costumes. Katy dressed up as a cowgirl, while Russell came as a Native American.
Katy also rode a mechanical bull! Some of her famous friends turned up for the event, including Chris Pratt, Anna Faris, Robyn, Adam Lambert, Sauli Koskinen, and Zachary Levi. Absent was BFF Rihanna, who is currently touring Europe. Katy told JustJared.com, "I like all my friends to have a good time. I want them to have an experience."After the party she tweeted, "We threw down, we ho-ed down". Katy turned 27 on October 25.