David Foster, 72, on age difference with Katharine McPhee, 37: 'We think we have it pretty together'

Katharine McPhee shows off her toned midriff in a cropped grey sweatsuit and fuzzy overcoat in LA

Katharine McPhee Wears Clothes Designed by Step-Daughters Erin & Sara Foster While Out for Dinner with Friends!

Katharine McPhee stands out in a scarlet sweater as she joins friends for dinner at Craig's