Actress Haylie Duff is joining the cast of the WB's "7th Heaven" as a pregnant college student.

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Hilary's big sister will enter the 10th season of the family drama as the girlfriend of Simon Camden played by David Gallagher, MTV News reported Tuesday.

Duff, 20, finished filming "Material Girls" with her younger sister in May and said she can't wait to start her new TV role.

"It's cool because she's such a strong character. I am pregnant on the show, which is kind of crazy, and it's a big stretch for me, but I feel so lucky to be able to work with a cast on a show that is so well put together," she said.

Duff said she has several film roles lined up after "7th Heaven" wraps at the end of the year.