[Las Vegas, October 4. Image via Getty.]

LAS VEGAS - OCTOBER 03: (EXCLUSIVE) Musician Pete Wentz, singer Ashlee Simpson-Wentz and sister, singer Jessica Simpson appear at the Wet Republic pool at the MGM Grand Hotel/Casino to celebrate Ashlee's 25th birthday October 3, 2009 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for Wet Republic)