The couple shared family photos and sonogram images on Instagram, and their first child, Archer, will become a big brother in March 2027.
On Thursday, October 1, singer Jesse McCartney and wife Katie Peterson announced they are expecting their second child together, with the baby due in March 2027.
Archer James McCartney, the couple's 17-month-old son, arrived in May 2025 and will soon take on the role of big brother to the family's newest addition.
Sharing the news on Instagram, the family posted photos of Archer sporting a bowtie and holding a sonogram strip while McCartney and Peterson coordinated in white outfits.
Their first pregnancy involved complications, as Archer arrived two months early and spent 70 days in the NICU. McCartney previously described the experience as "traumatic."
Fans flooded the post with well-wishes, celebrating the couple's growing family. One supporter wrote, "Omg congrats to you both I'm so happy that you're going to have another baby.