Jennifer Aniston has opened up about some of the more difficult parts of the Friends Reunion show, that she and her other co-stars filmed earlier this year.

All six of the main cast sat down with James Corden this year for a one-off reunion special as the gang went though the highlights from the show, as well as being joined by other guests.

The much anticipated special was great for fans to see all six main stars of the sitcom together again, for the first time since the show ended in 2004 - but Jennifer admitted it wasn't all smiles for her.

Jennifer Anniston
Jennifer Aniston

In a new interview with the New York Times, Jennifer revealed that she and her co-stars “had such blissful ignorance going into the reunion”.

“We were thinking, ‘How much fun is this going to be, to go back to Stage 24 exactly the way it was, exactly the way we left it?’,” Jen told the newspaper. “But it was a sucker punch to the heart.

“It turns out that it’s not so easy to time travel.”

Looking back to when Friends aired its finale in 2004, Jennifer said she and her castmates “were all bright eyed and bushy-tailed, looking toward the future”.

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“But there was a lot to come for everyone,” she continued.

“Hard truths and changes and loss and babies and marriages and divorces and miscarriages.

“One of the real emotional things for me was the realisation was that times were so much simpler then. For one thing, we didn’t have social media the way we have now.”

Jennifer recently told Rob Lowe on his podcast Literally!: “Going back there, it’s nostalgic in a way that’s kind of also a little melancholy, you know? Because a lot has changed and we have all gone down different roads, some easy and some not so easy for each of us.

“It was brutal, and also you can’t turn it off.”

She continued: “I think it really took us all down way harder than we anticipated.”