Jessica Simpson: 'I'm not having twins'

Jessica Simpson has revealed that she is not having twins.

The 31-year-old singer sparked pregnancy rumours in September, but last month finally confirmed that she is expecting her first child with fiancé Eric Johnson.

The singer spoke to Ryan Seacrest on his radio show, On Air with Ryan Seacrest, to talk about her pregnancy.

When Seacrest asked Simpson how she is doing, she said: "I'm all knocked up! It's amazing. I'm loving being pregnant."

Simpson also shared that she doesn't know the sex of her baby but she will find out and may not be able to keep it a secret.

"I'm a loudmouth. There's no way," she told Seacrest.

However, Simpson said that she doesn't mind having a boy or a girl. "I eventually want both so I'll be happy with either one, but it's definitely not twins," she confirmed.

Johnson and Simpson were expected to tie the knot on Friday in Hawaii but have reportedly postponed their wedding until after the birth of their first child.

Listen to Jessica Simpson's full interview at On Air with Ryan Seacrest below: