Mutual friend, fellow '90s and '00s comedy legend and upcoming Comedy Central late-night talk show host David Spade also attended Cox's birthday dinner.
"Happy birthday to @courteneycoxofficial and her plus one. xx," he wrote, alongside a photo of the actress with Aniston.
Other guests included Sara Foster, Mary McCormack, and jewelry designer Jen Meyer.
The cast of Friends has remained, well, friends since the show ended its 10-year run in 2004, and the actors have occasionally been spotted together. See pics of the recent Friends reunion and check out some more:
Check out the surprising secrets of Friends' final season.