IS LISA KUDROW A SECRET HOLLYWOOD MEAN GIRL?

Celebrities have come in full force to slam the Friends star

Move over Ellen beloved Friends M actress Lisa Kudrow's past is coming back to haunt her after a string of celebrities have come forward with stories of alleged "rude" behaviour by the star.

Most shocking of all is The Hills reality show star Spencer Pratt, who branded Lisa, 59, "one of the worst humans I've ever come in contact with" in an online post last week.

When fellow reality star Bethenny Frankel chimed in with her own uncomfortable encounter, during which Lisa blanked her on the talk show, Spencer, 39, decided to divulge a little more!

In 2009 at an NBC party, Spencer attended with his wife, Heidi Montag, when Lisa approached the couple.

"Phoebe [the name of Lisa's character on Friends] approaches, which was a little shocking since nobody had talked to us at all at the party," he said.

"Right in front of me, she tells Heidi she needs to get away from me as fast as possible because I'm going to murder her and I have the eyes of a serial killer.

"Heidi waits to see if it's a joke.

No laughs, [Lisa] just walks away.

That right there is the rudest moment I've ever encountered with a human being."

IN HER DEFENCE

While Lisa's rep has yet to respond to the claims, friends are quick to defend her. "You don't get as far as Lisa has without locking horns with a few people along the way," one friend tells Woman's Day.