Courteney Cox was the ''last guest to leave'' Jennifer Aniston's wedding.

The 'Cougar Town' actress wasn't among the guests spotted arriving for the nuptials between her 'Friends' co-star and Justin Theroux at their Bel Air home on Wednesday (05.08.15), but insiders insist that she was there and partied harder than almost anyone.

A source told People magazine: ''The last guest to leave was Courteney.

''She left right after Ellen Degeneres and Jimmy Kimmel. She left around 3 am. At 2 am. they still had the music pretty loud.''

The low-key wedding was described as being more like a ''warm house party'' and everyone had a great time.

A source said: ''It was done completely on the sly. It was their closest friends and very simple and intimate. There were lots of laughs as well as tears and the mood was light.''

Guests were entertained by Sia, who sang her hit 'Chandelier', and dined on a lavish feast of chicken, fish, sausage, fettuccine carbonara with pork and mostaccioli pasta with red sauce.

A source told Us Weekly magazine: ''It was really, really good. The cake was delicious!''

Friend and photographer Terry Richardson took pictures throughout the celebration, while Jennifer's friend Jennifer Mayer - who is married to Tobey Maguire - designed the pair's wedding rings.

The couple are believed to have headed to Bora Bora on honeymoon with a small group of friends.