"I think in marriage, when you're picking a partner, one of the things to keep in mind is, 'Would they be a good baby daddy?' " the "California Gurls" singer, 25, said during a YouTube interview in which she answered questions sent in by fans. "And [Russell will] be perfect."
But before letting her fiancé, 35, show off his parenting skills, Perry – who is already mom to the couple's "third child," a kitten named Krusty – wants to focus on tying the knot. "We are excited to get married, of course," she says.
And for the big day, the singer has already chosen one key fashion accessory: The perfect set of nails.
"I'm kind of a nail aficionado, freak. Sometimes I'll have pictures of my cat on my nails, or I had a Willy Wonka-themed birthday party, so I had Oompa Loompa on my nails," she says.
But Perry's taking a much simpler approach for the nuptials.
"I think for my wedding I'll do what is called wedding nails, where it's traditional and pretty," she says. "I don't know if I'd want Oompa Loompas on my nails while taking photos, so I'm going to have wedding white nails."