Courteney Cox has taken to Instagram to share a never-before-seen photo of her and her Friends co-stars.

The 54-year-old actress clarifies in the caption that the snap had been taken before the show even aired, writing, "The one where the six of us went to Vegas and no one knew we were F.R.I.E.N.D.S yet."

For fans, it provides a window into what their friendship was like before they really 'made it' in Hollywood.

Think about it - when the photo was taken, no one could have guessed what a phenomenal worldwide hit Friends would go on to become.

The sentimental snap shows the actress with the other five leads of the NBC sitcom (including Jennifer Aniston, David Schwimmer, Matthew Perry, Matt LeBlanc and Lisa Kudrow) having a blast together in a private jet.

The photo was taken during a group trip to Sin City organised by director James Burrows. While the cast and crew had already started filming for the show - that would go on to have a wildly successful 10-year run - none of the episodes had yet been seen by the public.

In a televised 2016 special made in honour of the TV director, Burrows talked about his thinking behind taking the cast on a trip to Vegas.

"We ate at Caesar’s Palace in Spago. I had me and six of them and I said -- I don’t know why I said this -- I said, 'This is your last shot at anonymity. Once the show comes on the air, you guys will never be able to go anywhere without being hounded,'" Burrows recalled, adding that he was certain the series would be a smash hit. "I knew the show had a chance to really take off."

Courteney Cox has taken to Instagram to share a never-before-seen photo of her and her Friends co-stars.

The 54-year-old actress clarifies in the caption that the snap had been taken before the show even aired, writing, "The one where the six of us went to Vegas and no one knew we were F.R.I.E.N.D.S yet."

For fans, it provides a window into what their friendship was like before they really 'made it' in Hollywood.

Think about it - when the photo was taken, no one could have guessed what a phenomenal worldwide hit Friends would go on to become.

The sentimental snap shows the actress with the other five leads of the NBC sitcom (including Jennifer Aniston, David Schwimmer, Matthew Perry, Matt LeBlanc and Lisa Kudrow) having a blast together in a private jet.

The photo was taken during a group trip to Sin City organised by director James Burrows. While the cast and crew had already started filming for the show - that would go on to have a wildly successful 10-year run - none of the episodes had yet been seen by the public.

In a televised 2016 special made in honour of the TV director, Burrows talked about his thinking behind taking the cast on a trip to Vegas.

"We ate at Caesar’s Palace in Spago. I had me and six of them and I said -- I don’t know why I said this -- I said, 'This is your last shot at anonymity. Once the show comes on the air, you guys will never be able to go anywhere without being hounded,'" Burrows recalled, adding that he was certain the series would be a smash hit. "I knew the show had a chance to really take off."