The Wipeout host - who gave birth to the couple's baby son Camden in September - told She Knows that she married Nick partly because she knew he'd take a hands-on approach to fatherhood.
"That is one of the things I looked for in him when we were dating," she said. "Not only how he is as a man and a husband, but how he will be as a father. All of my hopes and dreams have come true and he is awesome."
She added: "I was actually joking earlier that if Nick could nurse Camden he would! If he had boobs he would do it!"
Vanessa also explained how she and Nick came to name their newborn son Camden.
She said: "It was one of those crazy, 'How about that?' On the way to my doctor's office to find out if I was pregnant and to see the first ultrasound we passed Camden Drive - and we knew we always wanted a baby with the initials 'C' because John is Nick's dad's name.
"We wanted that to be the middle name so we wanted CJ Lachey. We fell in love with the name Camden and it means something to us and we will always remember the name Camden Drive!"
Nick recently joked that he often finds himself "sniffing" his baby son.