Katharine McPhee & David Foster Couple Up at Elton John's Charity Event in the UK!

Katharine McPhee and her boyfriend David Foster pose for a photo while attending the Argento Ball for the Elton John AIDS Foundation on Wednesday (June 27) in Windsor, England.

“Perfect night. Bye bye,” Kat captioned the photo on her Instagram Stories.

Nicole Scherzinger was also in attendance at the event.

“Was so happy to come out and support the @ejaf this evening. Thank you for all you do and to @eltonjohn and @davidfurnish for a beautiful event. #makeadifference,” Nicole wrote on Instagram.

FYI: Katharine is wearing a Siran gown.