Happy Hil!

Hilary Duff attended an early morning workout class before grabbing lunch in Hollywood, and the singer looked adorable in jeans and a plaid shirt, but her best accessory was easily her huge smile!

The "Chasing the Sun" chanteuse was in a great mood, even though she's in the process of splitting with husband Mike Comrie. "I'm separated from my husband right now, which has been a very difficult thing to go through, but we have a lot of love for each other and we have this beautiful baby. There's a song about Luca and a song about my separation and my love for this person, that maybe we're not meant to be together, or maybe we are. It's very, very personal," she recently confessed to Billboard.com about her songwriting inspiration.

We have a feeling we haven't seen the end of the Duffster and her hockey hubby!