The fashion mogul, 37, and husband Louis Eisner, 34, welcomed their first baby together, a son named Otto.
The couple tied the knot in a private ceremony in Dec. 2022.
The pair has been linked since October 2017, however, neither Olsen nor Eisner, an artist and the son of jewelry designer Lisa Eisner, have spoken about their relationship publicly and have kept a low profile through the years.
In August 2018, the couple was photographed when they stepped out arm-in-arm for a stroll in Los Angeles.