Lisa Kudrow Talks Awful 'Friends' Guest Star Who Body Shamed Her: 'Now You're F**kable'

Turns out, not everyone who went on 'Friends' was one.

Turns out, not everyone who went on Friends was one.

Lisa Kudrow appeared on Watch What Happens Live With Andy Cohen where she revealed one guest star who body shamed her on set.

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"The worst behavior, just off the top of my head," Kudrow answered when asked by a caller her worst guest star experience. "I rehearsed without makeup most of the week, and then on show night, I'm in hair and makeup, and was told 'Oh wow ... Now you're f**kable!'"

"That's bad behavior, I say," she added, revealing that she confided in a co-star after it happened. "I told Matt LeBlanc. He's a big brother."

WATCH: Matt LeBlanc and Lisa Kudrow Have a Super Sweet 'Friends' Reunion at the 2015 Emmys

Watch Kudrow explain the moment below.

Kudrow's lips remained sealed, however, when host Andy Cohen pressed her to reveal the identity of the culprit during the after-show.

WATCH: Lisa Kudrow and Courteney Cox Play 'Friends' Trivia Game, Completely Slay

Meanwhile, Kudrow also broke our hearts a bit during her appearance, when asked whether a Friends reunion was possible, a la the upcoming Will & Grace revival.

"I don't see it happening. It would be fun, but what would it be about?" she asked. "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?"

WATCH: Jennifer Aniston Reveals Why She's Considering a Return to TV

And it seems that Kudrow's former co-star, Jennifer Aniston, agrees.

Watch below for her take on why a reunion is probably not in the cards.