2017: Dating rumors around the couple began to spread.
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Foster and McPhee began to spark relationship rumors after they were spotted eating together in Miami at Nobu in May 2017, E! News reported. Citing an anonymous source, E! News reported at the time that the pair were “very intimate” during their dinner.
Later that year, one of Foster’s daughters added fuel to the rumors.
In September 2017, Foster and McPhee attended, and performed at, the Grammy Museum’s third annual gala, hosted at The Novo in Los Angeles, People reported. Foster was awarded with the Architects of Sound Award at the event. McPhee helped him debut a song from the stage musical he was working on that the time, according to People.
As People reported, Foster’s daughter Erin, who is two years older than McPhee, posted photos of McPhee and Foster from the event on her Instagram story.
“Excited about my new step mom” and “my parents,” she wrote in text-overlay captions on the photos that she posted.
In the wake of Erin’s Instagram story posts, an anonymous source close to the pair told People that the two weren’t dating. The source told people that Erin’s posts were sarcastic, and directed to “those who can’t seem to grasp that her dad and Kat can be colleagues, collaborators, and longtime friends without it being some big romance.”