10. David Foster and Katharine McPhee

This musical couple hit a high note despite their 35-year age difference. While Katharine McPhee (40) was dazzling audiences on American Idol, David Foster (75) was composing hits for legends like Whitney Houston. Their relationship drew skeptics, but their shared passion for music and red-carpet PDA shows that they’re in harmony—age gap and all.
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Edited by Priscillah Mueni