Hilary Duff marked her one year wedding anniversary with one BIG announcement: She's pregnant!

The 23-year-old former Disney star and husband Mike Comrie, who married on August 14, 2010, are expecting their first child together, Duff announced today on her official website.

"I can’t believe it has already been a year, time really flies when you’re having fun!" she writes, adding "We also want to share the exciting news that… BABY MAKES THREE. We are extremely happy and ready to start this new chapter of our lives."

She later tweeted "Wow! I am just overwhelmed by all of the wonderful messages everyone is sending! Thank you so much! Big hugs! Xxo."

Hilary and Mike hit the red carpet earlier this week for the opening of Kendra Scott's jewelry store in Beverly Hills, where Duff showed no hint of a baby bump. Check out the photos above.


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