Tori Spelling will not appear in the pilot episode of the forthcoming Beverly Hills, 90210 spin-off - because she is too busy caring for her newborn son.

The actress - whose late father, TV producer Aaron Spelling, created the original show - confirmed rumors in May she would reprise her role as Donna Martin in the forthcoming U.S. program.

But Spelling, 35, will have to hold off her appearance until the middle of the season - because she and husband Dean McDermott recently welcomed daughter Stella Doreen.

She tells People.com, "I'm looking forward to returning to 90210 in a later episode - but I just had my baby three weeks ago via C-section."

"So right now I have to focus on recuperating, and my first priority is my family."