But she plans to take a two month break when the little baby boy's born, she told the Sun newspaper.
'The band's my life'
The Kittens are her life and singing in the band's her dream job, according to Nat.
"I'm not going to give it up that easily" she said.
Nat also reckons having a baby won't affect the group badly at all.
Kerry certainly seems happy with her decision to leave after having baby Molly with hubby Brian McFadden.
And on Wednesday she beat Victoria Beckham to be named Celebrity Mum of the Year.
"It means so much to me. All I've ever wanted to be is a mum and have my own family" she said.