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I'll Be There for You! Courteney Cox 'Last Guest to Leave' Jennifer Aniston's Wedding (at 3 a.m.!)
Jennifer Aniston (left) and Courteney Cox
Angela Weiss/Getty
By Michelle Tauber and Mary Green
updated 08/08/2015 AT 06:15 PM EDT
•originally published 08/06/2015 AT 05:30 PM EDT
They have been there for each other since the beginning of
Friends, and when the time came for
Jennifer Aniston to
tie the knot with
Justin Theroux, her close pal
Courteney Cox was by her side.
Although Cox, 51, was not among the
unsuspecting guests photographed arriving at the couple's Bel Air mansion on Wednesday, PEOPLE can confirmed that not only did she serve as Aniston's maid of honor – she also closed out the night with the bride and groom!
"The last guest to leave was Courteney," says an observer. "She left right after
Ellen DeGeneres and
Jimmy Kimmel. She left around 3 a.m. At 2 a.m. they still had the music pretty loud."
Of course, Cox and Aniston have shared a long and close friendship, beginning in 1994 with their costarring roles on NBC's
Friends – the decade-long smash series that bonded them for life.
Wedding scene
AKM-GSI
Cox, who is
engaged to Irish rocker Johnny McDaid, and Aniston, 46, have often proven to be
each other's biggest fans.
Last July, Cox attended a dinner hosted by
Details in Theroux's honor, where the actress called her friend's fiancé "so handsome and cool."
In 2013, Cox joined Aniston and Theroux on one of their many
sizzling trips to Los Cabos, Mexico.
And after Cox's engagement last July, she
celebrated with a "girls' dinner" joined by Aniston and their fellow
Friends friend,
Lisa Kudrow, who also attended Aniston's wedding.
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