Molly Sims with her son Brooks on July 10, 2012. Credit: Gia Canali

Good golly, Molly Sims: what a cute baby!

The model turned actress, 39, and husband Scott Stuber welcomed their first child, son Brooks Alan Stuber, on June 19 -- and introduce their bundle of joy to the world exclusively in the new Us Weekly, on stands now.

"I've never been happier in my life!" gushes Sims, whose little boy weighed in at 7 pounds, 2 ounces at birth but now weighs 9. "He'll be big!" Sims says.

And first-time parenthood is going very smoothly for Sims and producer Stuber, 43, whom she wed September 24 of last year. "He is the sweetest baby," Sims tells Us. He loves to be swaddled, but he always sleeps with one arm up to his ear."

One slight snag? "He was born with a tooth! It's made breastfeeding awesome," Sims cracks, laughing. "I call him my little catfish."

Pick up the new Us Weekly for more adorable snapshots of baby Brooks and more on giving, how they chose the name and more!