Instagram Hudson High is now in session! In a nod to her birth name, Katy Perryrang in her 32nd year Saturday night with a high school-themed celebration straight out of a 1950s sock hop. BFF Kate Hudson also turned out for the bash, putting a fresh twist on the era's most iconic fashions with a Marc Jacobs skirt, embellished jacket and printed bandana tied across her head. With the help of wigs, prosthetics and even a faux-secret service detail, Perry and Bloom fully transformed into Hillary Clinton and a Donald Trumpcaricature for Hudson's Halloween party Friday night in Los Angeles.