Katharine McPhee and David Foster are planning to walk down the aisle sooner rather than later, according a source, and the couple are hoping to have children in their future, too! “Katharine is telling close friends she doesn’t want to have a long engagement to David Foster,” the source exclusively tells Us Weekly. “They are very much in love, and have previous marriages under their belts.” Foster, 68, was married to B.J. Cook.