Tiffani Thiessen, Jennie Garth

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Not all BFFs stand the test of time.

Such was the case for Tiffani Thiessen and Jennie Garth. In an interview Monday with Howard Stern on his Sirius XM radio show, Thiessen opened up—a little—about why she and her former 90210 costar are no longer friends.

"We had a falling out and we grew apart," Thiessen, 38, said. "I was the one who was hurt, let's just say that. I was the one who was hurt."

She declined to go into why they had that "falling out." Before that, however, Thiessen was a bridesmaid in Garth's wedding to Peter Faccinelli and even "saw her give birth to her first child."

"It's funny, our relationship started really rough and ended the way it started," Thiessen said. "It's water under the bridge…I've moved on. I wish her well."

Another former costar Thiessen no longer considers a pal? Tori Spelling.

The White Collar star said Spelling's 2006 split from husband Charlie Shanian was "a hard situation for everybody" because "we were close with Charlie…My best friend was Charlie's roommate."

Still, Thiessen said she and Spelling, 39, are civil now. "Our kids go to the same school, and she's moved on," she said. "I'm glad she's happy, and she's having tons of kids and she's great. I'm happy for her."

All's well that ends well.

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