Spencer Pratt has revealed why he thinks Friends actress Lisa Kudrow is 'one of the worst humans he's ever met'.
The Hills star, 39, who is married to Heidi Montag, slammed the mum-of-one in a TikTok video after a fan asked him who he thought was the rudest celebrity.
Spencer wasted no time in laying into Lisa, 59, replying: "Oh that's easy. Phoebe from Friends; hands down one of the worst humans I've ever come into contact with, by far."
Now he's explained why he made the shocking statement.
Filming himself on a beach, Spencer mused: "The year was 2009 and Heidi and I were invited to our first elite A-list party. It was clear when we got there, no-one wanted us there.
"It was almost like we were filming for Punk'd and a camera was going to pop up, but Heidi and I didn't care as there was delicious food and a open bar.
"As we were sitting there consuming a little caviar, Phoebe [Lisa] approaches, which was a little shocking as no-one had spoken to us at all at the party.
"Right in front of me she tells Heidi that she needs to get away from me as fast as possible because I'm going to murder Heidi and that I have the eyes of a serial killer.
"Heidi waits to see if this a joke, maybe this is a hidden camera party. But no laughs, she [Lisa] just walks away.
"That right there as the rudest moment I've ever encountered with a human being".
Fans were aghast by the revelation, with one posting: "What??? Noooooo".
Another said maybe Lisa was "having a bad day".
A third joked Spencer have been confused, quipping: "You must’ve met her twin sister Ursula cause it could’ve never been phoeb’s". [sic].
However, one slammed the former reality star, saying: "Not for nothing, I watched the show, maybe she was “looking out” for Heidi. We all felt bad for Heidi, you were a producer of the show too, was a lot."
Spencer and Heidi Montag– or ‘Speidi’ as they are commonly known – first found fame on MTV’s reality show The Hills.
They married in 2008, but in 2010 as the pair separated and nearly divorced.
On The Hills, Spencer was embroiled in lots of drama and known for his snappy comebacks and holding grudges.
Last year he hit out at his co-stars for their "ill-treatment" of him and wife Heidi.
In response to a tweet that asked if any of his castmates have apologised to him and Heidi for “how they treated” them, he said: "No, they’re the worst people ever,” Page Six reports.
Spencer's jibe about Lisa has gone viral with Real Housewives of New York City star Bethenny Frankel also giving her opinion about the Friends actress.
Replying to the reality star's post, she said: "That’s crazy. She was on my talk show and I had a crazy experience also".
Lisa appeared on Bethenny's talkshow in 2012.
Revealing more about the experience, she said: "She stood out as the person who wanted to be there least of the entire run.
"It was like I walked up to interview her at the supermarket."
Spencer and wife Heidi are currently expecting their second child.
They already have a son, Gunner Stone, four.
The Mirror has contacted Lisa's representatives for comment.