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Katharine McPhee wears matching swimsuits with her stepdaughters Sara and Erin Foster on family trip
Katharine McPhee showed off her incredible post-baby body in a tie-dye one-piece, designed by stepdaughter Sara Foster, during a family getaway to Turks and Caicos.While holding her one-month-old baby boy Rennie, the 37-year-oldSmash actress was surrounded by loved ones, who sat on the same lounge chair and posed in matching pastel swimsuits.Two of DavidFoster daughters, who he shares with ex-wifeRebecca Dyer,Erin, 38, and Sara, 40, were pictured withMcPhee as they smiled brightly into the camera.