Katharine McPhee is opening up about the decades-wide age gap between her and her husband, famed music producer David Foster.

Nobody is more impressed with Erin Foster and Sara Foster’s work than their stepmom, Katharine McPhee. “I'm so proud of Erin ...

Frazer Harrison/Getty Images Katharine McPhee's son may be a pro ... tot playing along perfectly on his drum kit at home as his mom McPhee Foster sang "I Will Always Love You." ...

Katharine McPhee Celebrates Mother's Day with Sweet Throwback Photo of Son Rennie: 'Best Day of My Life' David Foster Jokes It's 'Upsetting' When Son Rennie, 3, 'Pounds' the Piano: 'He's a Kid!' ...

"I loved it," Katharine exclusively told E ... "He's obsessed with his mom," she gushed, "which I'll take." "I saw [Post] in rehearsal," she shared, "he sounds incredible. There are so many ...

Katharine McPhee will be seen sharing screen space with Jill Hennessy, Ever Anderson and Ana Mulvoy Ten in the murder mystery ...