It's beginning to look a lot like Christmas - at least at Ashlee Simpson's house!
Ashlee's hubby, Evan Ross, posted a pic of the festivities on his Instagram. "Last night made it @ashleesimpsonofficial favorite holiday Christmas in California. It was a snowy one. Happy birthday baby," he wrote.
Jessica also posted a pic of herself heading to the party with a glittery face mask painted on. "Ready to celebrate 30yrs of having the best sister on the planet! Happy Birthday @ashleesimpsonofficial.