"(My husband) Mike and I are literally so obsessed with Luca. We’re like, ‘He’s perfect, we should just (have) one and (be) done', but I think once your baby starts getting older, you miss that baby phase and you go in for round two. I think maybe (we’ll have another baby) when (Luca) is two or three." Singer/actress Hilary Duff is planning to expand her family after becoming a first-time mum in March (12).