"I can happily confirm that they welcomed a baby boy," McPhee's representative Leslie Sloane said in a statement to USA TODAY on Wednesday. No other details were provided.
In December, the "American Idol" alum confirmed on Instagram she was expecting her first child. In the photos, McPhee cradled her baby bump while wearing a long powder-blue coat. Her accompanying comment was simply two blue hearts and a blue butterfly, perhaps giving fans a hint about her baby's sex.
In June, the couple celebrated their one-year marriage anniversary, with McPhee sharing photos of their wedding day on Instagram.
"A year ago today I married the love of my life," she wrote. "Thank you for always loving me and inspiring me in all aspects of my life. I love you. Here’s to the future! (Oh and happy anniversary to the other love of my life - this dreamy dress!"
The two met in 2006, when Foster mentored McPhee on Season 5 of ABC's "American Idol." They married at the Church of Saint Yeghiche in the South Kensington district of West London on June 28, 2019, according to US Weekly and People.
The couple's wedding day shares an anniversary with the release of McPhee's "Somewhere Over the Rainbow" cover, her first single after her run on "American Idol." The song dropped in 2006, and her now-husband Foster produced it.
"Life is full of beautiful coincidences, isn't?" she wrote on Instagram on June 28, 2019. "Thank you for taking me over the rainbow, David."
Foster, 71, opened up about his marriage to McPhee, 36, in a July interview with USA TODAY, in which he addressed their age gap.
"Well, we have that musical connection," Foster said of their relationship. "Look, we have haters on social media, and there's not a person around that's not going to make some comment about the age difference. But there are so many things that can bring a marriage down: It can be financial, it can be children, it can be geography, it can be infidelity. And one of them is age difference, but that's our only problem. Everything else is in line, so it's not going to bring us down."
This is Foster's fifth marriage, and he has five adult children.
This article originally appeared on USA TODAY: David Foster, Katharine McPhee are now parents to a baby boy