Pregnant Hilary Duff covers her belly in a white button-up shirt and dons a black beanie as she's seen with son Luca, 11, in LA

Hilary Duff shows off her growing baby bump as she steps out with husband Matthew Koma on Christmas Eve

Hilary Duff and husband Matthew Koma match in jean jackets as they step out for some last-minute holiday shopping in Los Angeles

Hilary Duff shares intimate snaps and videos as she commemorates fourth anniversary with husband Matthew Koma