Mandy Moore gushed over Hilary Duff's husband, Matthew Koma, as the fallout of Ashley Tisdale French's "toxic" mom group essay continues. Moore, 41, reposted an Instagram Story video shared by Koma, 38, on Wednesday, January 7, which showed her performing her hit song "Candy" at a benefit concert held in California to mark the anniversary of the Pacific Palisades fires.