Una Foden
The singer with her husband Ben Foden and their daughter, Aoife. Getty

Saturdays star Una Foden has announced that she and husband Ben Foden are expecting their second child.

The singer, who already has two-year-old daughter Aoife with the ruby star, revealed the baby news on Instagram by sharing a picture of her little girl wearing a T-shirt saying: "I'm going to be a big sister!"

She captioned the adorable snap: "I know lots of people have been guessing and Ben and I can now confirm that Aoife is going to have a baby brother or sister next year!!! We're all very happy!"

Within minutes the flame-haired beauty was inundated with congratulatory messages from her bandmates, fellow celebrities, and fans.

The new addition will be the fourth mini Saturday. Frankie Sandford gave birth to a little boy in July 2013 and Rochelle has a daughter with JLS star Marvin Humes.

Foden's news follows confirmation that a second Royal Baby is also on the way.

"Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child," Clarence House said in a statement.

"The Queen and members of both families are delighted with the news."