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February 17, 2015 03:05 PM

Bowling with her BFFs was just what Jennifer Aniston had in mind when it came to celebrating her 46th birthday.

On Wednesday, the actress, accompanied by her fiancé Justin Theroux, 43, was fêted at The Spare Room, a bar and gaming parlor at the Roosevelt Hotel in Los Angeles.

Pals including Courteney Cox, Amy Adams, Emily Blunt and Jimmy Kimmel all came out to toast the actress and party into the wee morning hours of Thursday.

“Jen and Justin have been very busy,” a source tells PEOPLE. “They just wanted to spend time with their friends.”

The party followed the couple’s holiday vacations in Telluride, Colorado, and Cabo San Lucas, Mexico. They’ll next attend the Oscars on Sunday in L.A., where Aniston will be presenting, before Theroux heads to Austin, Texas, in April to film his HBO series The Leftovers.

As for wedding plans, the source says the couple is still deciding on a date.

“No invitations have gone out yet,” the source says. “But a wedding will definitely happen.”

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