Hilary Duff Mike Comrie Malibu Intermix shopping hat

Hilary Duff announced Sunday that she is pregnant with her first child!

Sunday is Hilary, 23, and hubby Mike Comrie's one-year wedding anniversary, and Hil took to her Twitter account to announce the good news in honor of their special day!

Said Hil:

    "I can’t believe it has already been a year, time really flies when you’re having fun! 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."

Congrats to the happy couple!! Hilary and Mike, 30, celebrated their anniversary weekend in Malibu, where they went on a shopping spree. We caught up with them on Saturday, just a day before Hil's announcement (see pic above)!

Mike recently bought Hil a new car, so she wasn't sure what she'd get for their anniversary that could top that -- but a baby is the best news!

See all the pics of pregnant Hilary in our gallery below -- can you spot her baby bump?