The Boss is officially a grandpa.

Bruce Springsteen's wife and bandmate, Patti Scialfa, took to Instagram over the weekend to announce the arrival of the latest addition to the Springsteen family: Lily Harper Springsteen, the daughter of their youngest son, Sam.

Scialfa, 68, posted a pair of photos to mark the occasion. The first was a black and white shot of Sam, a New Jersey firefighter, and his partner wheeling a baby carriage, while the second was a color snap of Lily wearing a pink hat and pink bear mittens.

The photos, captioned "walking the baby" followed by a yellow flower emoji, drew congratulatory messages from the famous couple's friends, family and fans.

PHOTO: Bruce Springsteen and Patti Scialfa take a bow during reopening night of "Springsteen on Broadway" at St. James Theatre, June 26, 2021, in New York City.
Taylor Hill/Getty Images, FILE
Bruce Springsteen and Patti Scialfa take a bow during reopening night of "Springsteen on Broadway" at St. James Theatre, June 26, 2021, in New York City.

The baby is Springsteen, 72, and Scialfa's first grandchild. In addition to Sam, 28, the pair are also parents to son Evan and daughter Jessica.