The couple - who married in June 2011 - are reportedly "so thrilled" to be welcoming a son into the world in September.
Friends told In Touch that the pair have been discussing names but "haven`t picked one ye.
Vanessa recently admitted she was hoping the baby would be a boy because she loved the idea of a "mini" version of her 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."
However, Vanessa is also keen for them to have a girl in the future.
She said: "I can`t wait, when we keep having more children, to sprinkle boys and girls throughout the family. And if I have a little girl, she`s going to be Nick`s angel, I`m sure!"