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Katharine McPhee bares her taut tummy in a black sports bra and leggings as she does Pilates

Katharine McPhee showed off her toned tummy as she highlighted her workout routine on Instagram this week.

The 40-year-old singer — who is married to 74-year-old David Foster — used the app's Stories feature to upload video of her grueling Pilates regimen. Katharine wore her bob haircut loose for her gym session, letting the blonde highlighted locks graze her shoulders. Katharine and husband David share three-year-old son Rennie, who was born in February 2021 and joined Foster's five adult children

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