David Foster Pops the Question ... Katharine McPhee Says, 'Yes!'

7/3/2018 9:12 AM PDT

Katharine McPhee and David Foster Are Engaged

EXCLUSIVE

David Foster and Katharine McPhee are engaged after he popped the question during their European vacation ... TMZ has learned.

Katharine and David were on the Italian island of Capri Sunday as she showed off her engagement ring to family and friends over FaceTime. It's unclear exactly which day he proposed, but we imagine it was shortly before this pic was taken.

Katharine's rep, Leslie Sloan, confirmed the engagement. 

The couple's been dating since last year, and haven't been shy about PDA -- including the time Kat grabbed a handful of David's butt, and their full-blown makeout sesh.

This will be the actress/singer's second marriage. Her music mogul fiance's got her beat by a mile ... it's his fifth. If you're checking his first dance card -- B.J. Cook, Rebecca Dyer, Linda Thompson, and Yolanda Hadid were the previous brides.

Mazel tov!