Die 37-jarige musikant had sent Foster, 71, a video of herself posing in blue lingerie on a bed.
“I’m an underwear model now,” McPhee wrote in the text message exchange.
“Vava VavA-voom Hot mom — I tried u a bit ago but u are obviously busy stripping [crying laughter emoji]. U look amazing!!! Sjoe!!!” Foster responded.
McPhee and Foster got engaged in 2018 after dating for less than a year. The couple tied the knot in a London ceremony in 2019 and welcomed their son Rennie earlier this year.
“It took me awhile to kind of come around to really want to have a real serious relationship because I was very concerned with what people would think, and also I just wasn’t there yet either, ook,” sy het gese.
“I had been single for the last year so I was still in kind of that world, and I’ve known him for so long, and I knew he really liked me. It took me awhile.”
Foster has five adult children from previous relationships. McPhee and Foster first met in 2006 when McPhee was a contestant on the fifth season of “Amerikaanse afgod” and Foster was a mentor on the singing competition series.
McPhee is the Grammy winner’s fifth wife.
Fox News’ Jessica Napoli contributed to this report