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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 & Justin Theroux Married: Courteney Cox Last to Leave Wedding
Jennifer Aniston (left) and Courteney Cox
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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.

I'll Be There for You! Courteney Cox 'Last Guest to Leave' Jennifer Aniston's Wedding (at 3 a.m.!)| Couples, Marriage, Weddings, Friends, Courteney Cox, Jennifer Aniston, Justin Theroux

Wedding scene

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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.


Aniston is godmother to Cox's 11-year-old daughter, Coco, and in the February 2014 issue of More, Aniston spoke about her deep respect and affection for Cox.

"There's absolutely no judgment in Court," she said. "You'll never feel scolded. She's extremely fair, ridiculously loyal and fiercely loving."

She added, "I've slept in her guest bedroom a lot. Without giving away too much of my private stuff, all I can say is she's been there for me through thick and thin."
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