May 08, 2013 08:00 AM

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Rachael Leigh Cook‘s perception of parenting is about to change — she’s pregnant!

The Perception star, 33, and husband Daniel Gillies are expecting their first child this fall, PEOPLE confirms.

“Thanks for the love you guys,” the actress Tweets, while The Vampire Diaries actor adds, “Thank you everyone. We are delighted.”

Cook — best known for her role in She’s All That — and Gillies, 37, will celebrate their ninth wedding anniversary in August, after tying the knot in 2004.

In addition to their television roles — including the dad-to-be’s upcoming performance in The Originals, a spinoff of the Vampire series — the couple are also preparing for the May 15 premiere of Broken Kingdom, which Gillies both produced and stars in alongside Cook.

— Anya Leon

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