In the cute snapshot, a glowing McPhee poses while on a beautiful sunny afternoon walk with her baby boy resting comfortably in a baby carrier.
McPhee and Foster, 71 welcomed their first child together in late February. The couple has not yet revealed the name of their little one.
The pair first met on the set of American Idol in 2006 when McPhee was a contestant and the 16-time Grammy winner appeared as a guest mentor. They were engaged in 2018, a year after his divorce from fourth wife and Real Housewives of Beverly Hills star Yolanda Hadid. McPhee and Foster married in 2019 at the Church of Saint Yeghiche in the South Kensington district of West London.
While this is McPhee's first child, the music executive shares daughters Sara, Erin and Jordan with second wife, Rebecca Dyer; and daughters Allison and Amy from previous relationships.
See McPhee's sweet first photo with her newborn son here.