Katy Perry hosts belated birthday party

Katy Perry and Russell Brand turned out in costume on Friday for a Wild West-themed party for her recent bithday.

Adam Lambert, Zachary Levi and Anna Faris all dressed up for the bash in LA two weeks after Katy Perry turned 27.

The I Kissed A Girl singer wore a pink cowgirl outfit and rode a mechanical bull at Wild West Birthday Ho Down Throwdown, as Brand, who wore an Indian costume, watched.

Perry tells JustJared.com: "I like all my friends to have a good time. I want them to have an experience."