Britain's most famous super-sized family is set to expand once more, as Sue and Noel Radford's daughter Katie has announced she's pregnant.

The 21-year old-shared the joyous news on social media last night (May 19), revealing that she and her long-term beau Connor are expecting their first child together. The couple threw a gender reveal party over the weekend, where friends and family gathered to find out whether it would be a boy or girl.

In a series of Instagram posts, Katie showed off the festivities, including a moment where Connor kicked a football that released blue smoke, indicating a baby boy is on the way. Katie, donning a chic white dress that accentuated her growing bump, was visibly thrilled, dropping to the ground in excitement as blue confetti burst from her cannon.

READ MORE:

She captioned the heart-warming posts with "Baby Carter mummy and daddy can't wait to meet you! " which prompted an outpouring of congratulatory messages from followers.

In an Instagram post, Millie, who is also a mother-of-three, couldn't contain her joy. She wrote: "Finally another little boy! You're going to be the best mummy ever, can't wait to meet my baby nephew!"

Her other sister Sophie penned: "So so so happy for Katie and Connor. A beautiful baby boy! " While Aimee expressed: "So happy for you both - another little nephew!"

The news of Katie's pregnancy comes after she asked Sue and Noel if Connor could move into the family's Morecame home in scenes shown on their reality show 22 Kids and Counting earlier this year.

"It's been a really difficult decision actually...I don't know, it's a bit tricky to be honest," Noel said. "Connor's obviously been trying to prove that he can play a proper role in the house," Sue added. "But I'm still not sure. It's expensive having other people in the house."

Sue and Noel were later seen sitting down Katie and Connor to deliver the verdict. Katie begged: "I do really want Connor to move in. I think I'll be really upset if he can't," to which Noel explained: "Well, I know you really want to live together."

Sue went on: "We are at capacity, the house is bursting at the seams." But the mum-of-22 beamed: "You are pretty good with the vacuum, so all good..." before Noel revealed: "Everyone here needs to pull their weight. But you've been working really hard to prove yourself. We like you Connor, you can move in."