As the countdown to the Friends reunion begins, the cast have been spilling the beans about behind-the-scenes secrets, bloopers and discussing their favourite guest stars on the show.

Alongside the core six – Courteney Cox, Jennifer Aniston, Lisa Kudrow, Matt LeBlanc, Matthew Perry and David Schwimmer – Friends had a whole host of celebrity guest stars on the show during its 10-year run including Paul Rudd, Julia Roberts, Susan Sarandon, George Clooney and more.

In the run-up to the premiere of Friends: The Reunion, the cast sat down with Access Hollywood, where Aniston, Kudrow and Cox discussed their favourite guest stars throughout their decade on the sitcom.

READ: Here’s where you can watch the Friends reunion in the Middle East

Kudrow, who played Phoebe Buffay, admitted in the interview that she was “blown away by so many”, while Cox, who played Monica Geller, highlighted Tom Selleck as “the sweetest”.

As for Aniston, who played Rachel Green, one of her favourite guest stars was Reese Witherspoon and Ben Stiller. She also mentioned her “fantastic” ex-husband, Brad Pitt, who starred in the episode The One With the Rumor.

“And Mr Pitt was wonderful,” Aniston said. “He was fantastic.”

In the trailer for the reunion, Cox, Aniston, Kudrow, LeBlanc, Perry and Schwimmer appear together reflecting on iconic moments from the show, doing a table read from notable scenes and also appear in the famous purple Friends apartment.

There’s also a huge amount of A-list guests set to appear on the show including David Beckham, Justin Bieber, BTS, James Corden, Cindy Crawford, Cara Delevingne, Lady Gaga, Kit Harington, Larry Hankin, Mindy Kaling, Thomas Lennon, Christina Pickles, Tom Selleck, Reese Witherspoon, Malala Yousafzai and more.

The infamous subject of Ross and Rachel’s relationship is brought up – the trailer even opens with Schwimmer questioning his co-stars over the length of the letter Rachel wrote him after they got back together (for probably the third or fourth time).

And yes the famous question was asked to the cast – were Ross and Rachel really on a break? It seems to still divide opinions…

We can’t be able to relive memories from the most iconic sitcom of all-time on OSN this Thursday, May 27.

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Images & Media: Getty / Warner Bros. / HBO Max