Una Healy is hoping her boobs stay the same size after her pregnancy.

The Saturdays singer - who is expecting a girl with her rugby player boyfriend Ben Foden - has found her 34B chest has increased to a DD cup size, and she is hoping her assets do not go down when she gives birth.

She said: "My boobs are massive. They've grown from a 34B to a DD. I'm not complaining. I just don't want them to go down afterwards."

The 30-year-old pop beauty isn't worried about fitting into her tour costumes when she goes on the road with her bandmates Rochelle Wiseman, Vanessa White, Frankie Sandford and Mollie King in December because their stylist is making her some special outfits to cope with her increased size.

She added to new! magazine: "Our stylist is creating some sexy Saturday-esque maternity wear!"

Una admitted Ben - who recently spent seven weeks in New Zealand representing England at the Rugby World Cup - is "fine" about her touring with her baby bump, and she thinks it's "healthy" for the pair's relationship if they are away from each other now and again.

The Irish singer explained: "He's fine. It's only three weeks. I think he'll get to come along to a few shows.

"I think it's healthy because you don't get used to being together all the time and it's so important to still see your friends and for them to do "guy" things. So then they're dying for us to come back and they appreciate us all the more."