Ashlee SimpsonAshlee Simpson-Wentz couldn't be more excited about her big sister's engagement. She was overheard gushing about the upcoming nuptials at the launch in Hollywood, adding that Jessica Simpson's beau brings out the best in her.

Last week, Jessica announced her engagement to Eric Johnson. No word if Joe Simpson will perform the ceremony, as he did for Ashlee's wedding, but Simpson's parents celebrated with a small engagement party at their California home. About 50 guests, including Ashlee and husband Pete Wentz, attended the soiree. More Celebrity Sightings >>