Malin Akerman
the proud new mommy to a beautiful baby boy!

On Tuesday, the "Rock of Ages" star welcomed her first child with husband Roberto Zincone.

The blonde beauty shared the big news via twitter posting, "My husband and I welcomed our beautiful, healthy baby boy to this world this morning! Biggest joy of my life!!! #lovemykid."

Later in the evening Milan shared her little guys name: "PS and his name is...Sebastian Zincone :))) Love him more than life itself!! ?#whatafeeling?"

The 34-year-old "Heartbreak Kid" star tied the knot with Robert (The Petalstones drummer) in the summer of 2007.

We are so happy for the adorable couple -- and we're loving their little guy's name! Click "Launch Gallery" above to find out more of your favorite celebs' baby names!

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