Vanessa gave birth to Camden John Lachey on Wednesday (12.09.12) and the proud parents say he has "redefined love" for them.
They told People: "We are incredibly proud to announce the birth of our beautiful baby boy, Camden John Lachey.
"Born today at 6:54 p.m., he came into this world at 8 lbs., 9 oz. and 21 inches. Love has truly been redefined for both of us."
Vanessa previously admitted she was hoping the baby would be a boy because she loved the idea of a "mini" version of her 38-year-old husband.
She said: "It`s going great, knock on wood! I`m feeling awesome and no morning sickness, no crazy cravings.
"I`ve always envisioned a little boy first. Maybe because when I fell in love with Nick - the man of my dreams and the father of my children - I could easily imagine falling in love with the mini-him; that`s how I see it.
And the 31-year-old presenter won`t be afraid to join in when it comes to male activities either when the youngster is a little older.
She has said: "I want to be able to throw a baseball with my son and want to be able to just wrestle with him in the yard, and I want to do all that fun stuff."