Hilary Duff is exhausted, though you’d never know it. As she talks about her new life as a mum-of-three, the actress’ face lights up. But her smile is quickly replaced by a furrowed brow and apologetic expression when she’s interrupted by an alarm. “That’s my timer to go feed my daughter. I’ll be right back!” she says, excusing herself as she hops off the living room sofa of her Beverly Hills home.
Duff’s life these days is full of joy – and plenty of juggling. In March the former child star, 33, and her husband, singer-songwriter Matthew Koma, 34, welcomed daughter Mae James, who joins their older daughter Banks, 2, and Duff’s son Luca, 9, from her first marriage to Mike Comrie. “I have help, but babies just want their…