The mum to Britain’s biggest family revealed she first fell pregnant when she was thirteen – and her partner was an 18-year-old man.
Sue Radford, now 43, shocked viewers with the revelation on TV show 21 Kids and Counting.
It followed her journey through pregnancy as she gave birth to her 21st nipper – Bonnie Raye.
But it was the story of her first that caught most viewers’ attention.
Sue conceived eldest, Sophie, when she was a schoolgirl, and now husband Noel was a legal adult, five years her senior.
A stunned viewer tweeted: “They are lovely kids but I can’t help but feel a bit weird about the fact when he was 18 he got a 13 year old pregnant .
At the end of the episode, Sue said she gave birth to the lastest bundle of joy after just 12 minutes in labour.
The Radfords spend between £100 and £250 on presents for each of the 21 children at Christmas – working out at a total of £5,250.
Their family shot to fame on the Channel 4 documentary 15 Kids and Counting in 2012.
Newest arrival Bonnie Raye tipped the scales at 8lb 4oz when she arrived last month at the Royal Lancaster Infirmary, where midwives have delivered 14 of the Radfords’ children.