Celebrity Ashlee Simpson's '80s Prom Night Birthday With boyfriend Pete Wentz, the 23-year-old parties in pink with 200 pals By People Staff Published on October 15, 2007 07:00 PM Share Tweet Pin Email 01 of 05 ANGEL & KING Michael Caulfield/WireImage Ashlee Simpson and boyfriend Pete Wentz celebrate her 23rd birthday with, like, a totally awesome party: an '80s prom night theme bash at her parents' house in L.A. earlier this month. 02 of 05 BIG TEASE Michael Caulfield/WireImage Jessica Simpson gives a nod to Madonna – fingerless lace gloves! – and hairspray as she takes her prom picture. 03 of 05 DATE NIGHT Michael Caulfield/WireImage Big hair, big night: Friend CaCee Cobb and beau Donald Faison (Scrubs) show their love for the '80s. 04 of 05 PRETTY IN PINK Michael Caulfield/WireImage Pals Simpson and actress Emmy Rossum rest up between songs. Throughout the night, music by the Cars, the Cure, Boy George and more got the 200 guests on the dancefloor. 05 of 05 MOST LIKELY TO ... Michael Caulfield/WireImage Have a blast! Fall Out Boy rocker Wentz – who shared a dance with the birthday girl to Bryan Adams's "Everything I Do" – says, "Now we can say we are high school sweethearts!"