Hilary Duff Is Pregnant

By Dahvi Shira

08/14/2011 at 04:00 PM EDT

Happy anniversary ... and congratulations!

Hilary Duff and husband Mike Comrie, 30, who are celebrating their first wedding anniversary this weekend, are expecting their first child, the singer-actress announced on her official website.

In the post, Duff, 23, reflected on her marriage– she and Comrie wed on Aug. 14, 2010 – and then made her big announcement.

"We also want to share the exciting news that… BABY MAKES THREE," she wrote. "We are extremely happy and ready to start this new chapter of our lives."

RELATED: Pregnant Hilary Duff 'Overwhelmed' by Well Wishes

Earlier this year, rumors circulated that Duff was expecting.

"It's just a rumor guys!" she Tweeted in January. "Not true. But thanks for all the good wishes! Lol."