Just months after announcing her pregnancy, Hilary Duff has confessed that her growing baby feels like an alien invasion.

It's so different. It's literally like an alien has taken over your body. One day I'll have a good day, and one day I'll have a bad day, and it kind of goes like that, she told MTV News.

The 24-year-old actress and singer is in the middle of a book tour in support of her second novel, Devoted. The novel is a follow up to Duff's 2010 release, Elixir, which was recently recognized as a New York Times bestseller.

Duff and husband, NHL player Mike Comrie first announced their pregnancy on their one-year wedding anniversary in August.

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!!! she wrote on her Web site.

During her MTV interview, Duff talked about waiting to find out the sex of her baby.

I can already find out, but I want my mom and my sister to be there, but they've both been out of town. When they are both in the same city and we're all there, then we'll find out, she said.

As for a name, the former Disney star wants to keep things as normal as possible.

If we give the baby kind of a unique name, we need to give it a normal middle name in case it hates it and wants to like fit in better and then maybe we just need to go totally traditional, said Duff.

Here is a photo tribute to Hilary Duff, mommy-to-be.