She and musician David Foster first sparked relationship rumors about a one-year ago.
And Katharine McPhee made it clear why she won the heart of the Canadian composer, 68, as she paraded her bikini body during a romantic couple's vacation to Capri, Italy this weekend.
While sharing a photo from her trip on Instagram, the American Idol alum, 34, joked about how much effort she put into the social media shot, captioning the picture: 'If only you saw the first 50+ pics it took to get these two.'
Fun in the sun! Katharine McPhee wowed in a black bikini and high-waisted in an Instagram from her Italian vacation with beau David Foster shared on Sunday
Katharine was simple and sexy in a black bikini top paired with high-waisted bottoms in a blue striped pattern.
The singer/actress accessorized with rhinestone framed sunnies as she leaned forward to give up a glimpse of her full cleavage.
As the caption noted, the photo was taken by her much older love.
The Broadway Beauty, who is currently starring in the musical Waitress, gave her 456k followers a closer look at her outfit on her Insta-Story where she showed off a choker and longer charm necklace.
Redo! the American Idol alum, 34, joked about how much effort she put into the social media shot,