Though no other details of the newborn - including the name - has been released, a source told the outlet, "Everyone is doing great". News of their engagement surfaced in January 2017 when Dunst was spotted with what appeared to be an engagement ring.
Reps for the couple are yet to confirm the news, and no other details are known.
We will remind, about pregnancy Kirsten dunst first began in December. In June, the actress told Marie Claire U.K. that she was ready to focus on starting a family.
However, Kirsten Dunst has also said that she's "excited" about the prospect of having a baby, and has been looking to Pinterest for wedding planning ideas.
They announced their engagement in January a year ago.
I work with three years.
"I wasn't one of those 'I need a baby!' people until my goddaughter was born", she said.
That love is just like... you can't experience that unless you have a kid'. I just love that love.
The couple, who've reportedly been engaged since January 2017, met on the set of FX's Fargo back in 2015.