Jessica and Eric Celebrate Their Engagement

Credit: Kevin Mazur/

Less than a week after Us Weekly exclusively broke the news of their engagement, Jessica Simpson, 30, and Eric Johnson, 31, celebrated with friends and family at a party on Thursday night.

About 40 to 50 people, including a few NFL players, gathered at the California home of Simpson's parents, Joe and Tina. Guests were served hamburger and veggie burger sliders, chicken skewers, mini pizzas, shrimp, and for dessert, mini cupcakes.

"They were very happy," a friend of Jessica's tells "It was the first time they had seen a lot of their friends since the engagement. She was excited to see her girlfriends."

The couple began dating in June, when Johnson was separated from his wife of five years, Keri. (His divorce was finalized October 7.) Simpson split from ex-husband Nick Lachey, 37, in 2005.

Up next for the twosome is a trip to NYC, where Simpson is scheduled to perform during Macy's Thanksgiving Day parade.