Ew, ew, ew, ew.

Friends has had a tonne of guest stars over the years, but not all of them were pleasant people, it turns out.

Lisa Kudrow, who played Phoebe Buffay on the hugely popular sitcom, shared a little story that there was one person who made a horribly sexist comment to her on the set of the show.

NBC/Warner Bros Getty Images

"The worst behaviour, off the top of my head?" she said on Watch What Happens Live with Andy Cohen (via E! Online). "I rehearsed without make-up most of the week, and then on show night, I'm in hair and make-up, and I was told, 'Oh wow, now you're f**kable'.

"That's bad behaviour, I say."

Lisa was asked what happened next, and if she retaliated to that disgusting comment.

"I told Matt LeBlanc," she said. "He's like a big brother."

NBC

Although Lisa refused to divulge who the guest star was, she did confirm that it was not Charlie Sheen (who played her love interest Ryan in 'The One with the Chicken Pox').

The actress also said recently that she can't see a Friends reunion ever happening.

"It would be fun, but what would it be about?" she said.

"Think about it. The thing we liked best about the show was that they were 20-somethings and they were their own family. Now, they all have families, so what are we going to watch?"

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