The 'Friends' cast had an "unspoken rule" not to date one another.

Friends cast

Friends cast

Although Jennifer Aniston, David Schwimmer, Matt LeBlanc, Matthew Perry and Courteney Cox all saw their sitcom alter egos hook up with one another at various times on the show, the group - along with castmate Lisa Kudrow - insisted their chemistry never spilled over into real life because they were determined not to "mess with" the bond they had on screen.

Matthew said: "There was a rule, it was really important to the six of us, that we kept a friendship. Hooking up could have caused a strangeness that might mess with things. And we are really good friends to this day."

David added: "We didn’t want to jeopardise any of the great relationships and friendships we had established. It was kind of an unspoken rule."

But Courteney insisted it was never a subject she'd spoken to anyone about.

She told 'Access Hollywood': "It’s a smart idea, but I don’t remember talking about it."

Meanwhile, Jennifer admitted her ex-husband, Brad Pitt, was one of her favourite guest stars on the show thanks to his 2001 appearance in the sitcom's Thanksgiving episode, 'The One With the Rumour', in which he played Will Colbert, who joined his former classmates Rachel, Monica and Ross for dinner, with the fashionista unaware he hates her and starts the 'I Hate Rachel Green' club.

Discussing their favourite guests, the stars mentioned Tom Selleck, Giovanni Ribisi, Sean Penn, Alec Baldwin and Charlie Sheen as among the best.

Lisa said: "I was blown away by so many. Ben Stiller was really funny. I thought Reese [Witherspoon] was fantastic… Paul Rudd was great."

Jennifer then said of her then-husband: "And Mr Pitt was wonderful."

Lisa agreed: "He was fantastic!"

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