Katy Perry and her husband Russell Brand turned out in costume on Friday (11Nov11) for a Wild West-themed party to mark the singer's recent birthday.

Adam Lambert, Zachary Levi and Anna Faris also dressed up for the bash in Los Angeles, two weeks after Perry turned 27 on 25 October (11).

The I Kissed a Girl hitmaker wore a pink cowgirl outfit and rode a mechanical bull at the Wild West Birthday Ho Down Throwdown, as Brand - who sported an Indian costume - looked on.

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