May 12, 2013 01:00 PM

Just in time for Mother’s Day, Jennifer Nettles is finally sharing with the world what she already knows: her 5-month-old son is a blue-eyed joy!

And the Sugarland singer has revealed the first picture of her newborn. “So much love and joy on my first Mother’s Day! A very Happy Mother’s Day to all the Mamas,” she Tweeted Sunday, with a longer note to follow on her website.

Nettles gave birth to Magnus Hamilton with her husband, entrepreneur Justin Miller, in December. And she’s already adapting quite well to motherhood.

Valarie Allyn Bienas/Sugar Cookie

“I’m so excited!” she tells PEOPLE. “He’s super, super sweet. We made a deal before he was born. I said, ‘Look, you can cook as long as you want, as long as you come out and latch like it’s your job and have a sweet demeanor.’ He kept his part of the bargain!”

As for Nettles’ plans for her first Mother’s Day, the singer says, “We’re going to have a Mother’s Day brunch. It’s a good time around naps! We’ll do a nice brunch and just relax.”

For another photo of Jennifer and Magnus and more on her life as a new mom, pick up a copy of this week’s PEOPLE, on newsstands Friday.

— Kevin O’Donnell

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