The former Sabrina the Teenage Witch star would like to have another kid herself, but hasn't written off the idea of adoption.
The 35-year-old told US OK! magazine: 'I don't know how that’s going to happen or exactly where it is going to fall in but I think that maybe when ours are a little bit bigger and I can't have kids anymore maybe then that will be the right time for it.'
Melissa, who already has two sons with Mark, Mason, five, and three-year-old Brady, explained that she would like an even bigger family.
The star added: 'My mum had seven children.
'I just figured I'm like her and I'm going to want lots of kids and so I figure when I am done having children, then I'll want to have more so I'll love to adopt. I would love to keep going and growing with my family.'