Taylor Hanson and his wife Natalie are set to welcome their seventh child together.
The MMMBop singer, 37, shared a sweet snap of himself and Natalie strolling through a field, smiles on their faces, announced that she's pregnant again.
They welcomed their sixth, Claude, in 2018.
"The best kind of unexpected," Taylor wrote, "Number seven coming this December. #2020."
Natalie shared something similar, captioning: "biggest little surprise in a long time. baby number seven coming this December."
The happy couple also share Jordan, 17, Penelope, 15, River, 14, Viggo, 11, and Wilhelmina, 7.
Fans soon flooded the comments section with messages of congratulations.
"Let’s go!! Yay baby number 7! I speak from experience the 7th kid is the best!" one wrote.
"Congrats!! And lol, more babies are never unexpected from you two," another laughed.
One wrote to Natalie: "this is the best news and mama, you are GLOWING! Congratulations!"
"Best surprise ever! xoxo," a fourth commented.
Taylor, who formed Hanson alongside brothers Zach and Isaac, is also one of seven.
They welcomed Claude, who's now nearly two years old, on Boxing Day 2018.
Sharing a snap of Natalie cradling the tot on her birthday, Taylor shared a touching tribute to his "best friend."
Proud dad Taylor wrote: "Happy Birthday to my best friend and beautiful wife Natalie.
"Overjoyed to share the gift of a lifetime, little Indiana Hanson, born 12.26.2018."
People Magazine then reported that the baby's full name was Claude Indiana Emmanuel Hanson, and that he'd been born in Taylor's hometown of Tulsa, Oklahoma.
"What's better than being a dad of five?" Taylor asked when Natalie fell pregnant for the sixth time.
"Perhaps being a dad of six. Baby Hanson coming in December and we are over the moon."