'Beverly Hills, 90210' stars Jennie Garth and Tori Spelling reignite feud with co-star Tiffani Thiessen

You can't sit with us!

Former "Beverly Hills, 90210" stars Jennie Garth and Tori Spelling still have some strong feelings about co-star Tiffani Thiessen -- 17 years after their show ended.

Garth and Spelling appeared in a recent episode of "RuPaul's Drag Race" where they refused to say Tiffani's name while critiquing a drag queen who impersonated her "90210" character Valerie Malone.

"As Ti --, how do you say it?" Jennie said to the panel while offering some critique to the contestant.

"Just say: 'That which we don't speak of'" Tori suggested, which is an expression used to describe "Harry Potter" villain, Voldemort.

"Yes, we know her as 'that which we don't speak of,'" Jenny said amid laughter from the judge's panel.

The stars of the show, which follows a group of teenagers through high school, college and eventually into adulthood, have openly talked about the feud in the past.

Thiessen joined "Beverly Hills, 90210" in its fourth season after Shannen Doherty left, and things were rocky between the actresses from the start. While speaking to Howard Stern in 2015, she revealed the females "were not very nice to me."

Tiffani then patched things up with Jennie after she apologized (for what, she didn't specify). Then the two had a falling out and they grew apart.

"I was the one who was hurt, let's just say that. I was the one who was hurt," Thiessen told Stern. "It's funny, our relationship started really rough and ended the way it started."

The bad blood between Tiffani and Tori happened over a cheating scandal. Tori cheated on her first husband, Charlie Shanian, with Dean McDermott in 2006. Charlie was a close friend of Tiffani's, and she revealed to Stern that "it was a hard situation for everybody."

Since then, Tiffani has made quite a career shift. She's left the petty drama behind and is somewhat of a lifestyle guru. She has a show on the Cooking Channel, "Dinner at Tiffani's."