ET was with Tori Spelling on the set of "90210," where the star shares her thoughts on returning to the zip code that made her famous! Watch the video to hear how Tori fell back into her role as Donna Martin, and see what costar Jennie Garth says of their on and off-screen friendship!

"At first I was really nervous. It was like being the new kid at school," the "Beverly Hills, 90210" alum tells ET about joining the new series. "And then, it was funny. Half way through my first day, I was like, 'This feels oddly familiar. I know this girl.'"

ET was first on the set of The CW's "90210," where we also heard what Tori's pal and costar Jennie thought of her addition to the show.

"I thank my stars for her. She's so much fun," Jennie tells ET about Tori. She goes on to say that she trusts Tori, and the two "just click."

Watch the video to also see the ladies shoot a scene with Oscar-winning screenwriter Diablo Cody. You can catch Donna's return to Beverly Hills on Tuesday April 14 at 9 p.m. on The CW.