The 31-year-old singer, who has been dating Scott for around ten years, says the couple's friends call them the best baby sitters, reported Contactmusic.
"We're both really broody. Friends laugh at us and say we're the best babysitters, which we are. I really don't think it's going to be long now," she said.
Walsh reveals that the couple intends to get married in future.
"Scott does really want to get married at some point and it will happen. I've never been one of those girls who wanted a big extravagant wedding, though, so I think I'll be more, 'Can we just do this really quickly please and really simply?," she added.