Sue and Noel Radford from Lancashire in the UK made the announcement via their YouTube channel.
In the video, Sue Radford confirmed she is expecting a little girl.
The video was shortly followed with an ultrasound image which was uploaded to Instagram, followed by an image of their gender reveal.
'We can’t wait to welcome you into the family precious little one 💗😍if you missed the vlog yesterday head over to watch it the link is in our bio 😃#soblessed,' the family wrote.
Sue and Noel already have ten boys and ten girls, ranging in ages from 29 and down.
Their family currently consists of Chris, 29, Sophie, 24, Chloe, 22, Jack, 21, Daniel, 19, Luke, 17, Millie, 16, Katie, 15, James, 14, Ellie, 13, Aimee, 12, Josh, 10, Max, 9, Tillie, 8, Oscar, 6, Casper, 5, Hallie, 2, Phoebe, 22 months, and Archie, who was born last September.
Their family currently consists of Chris (29), Sophie (24), Chloe (22), Jack (21), Daniel (19), Luke (17), Millie (16), Katie (15), James (14), Ellie (13), Aimee (12), Josh (10), Max (nine), Tillie (eight), Oscar (six), Casper (five), Hallie (two), Phoebe (22 months), and Archie, who was born just last September.
The couple have also had a stillborn baby named Alfie in 2014.
Sue and Noel met when they were just seven and later became romantically linked.
Sue fell pregnant with the couple's first baby at the age of 14 and the pair were married when she was 17 years old.
The family became the focus of UK show, 20 Kids and Counting and despite vowing two-year-old Hallie would be their last back in 2015, have continued to have more babies.
Sue and Noel do not claim any state benefits from the UK government, despite the enormous size of their family.
Congratulations to the growing bunch!
This article originally appeared on New Idea.