By Breaking Celebrity News Staff

What better way to celebrate moving out of your Beverly Hills home than by throwing a party?  On Friday night Jennifer Aniston did just that.

After spending two years refurbishing the entire property down to the finest detail and then putting it on the market and getting an astounding $36 million for it, the Horrible Bosses actress threw a lavish bash for friends and family at the impressive hillside mansion on the last weekend before she turned the keys over to the new owner.

"She just wanted to have one more great get together with friends at the house before she moved out," a source told People.

Present at the party was Jennifer’s new beau Justin Theroux. The actor and screenplay writer, who co-wrote the Oscar nominated Tropic Thunder, turns 40 August 10 so the couple celebrated that milestone as well.

As Breaking Celebrity News previously reported, Jen and Justin are looking for a house together in L.A.  He already calls New York home..