Blue singer Antony Costa's fiancée is pregnant with their first child.

The boy band star and his partner Rosanna Jasmin both made the announcement on Twitter today (29.12.13) after they got engaged on her birthday on Monday (23.12.13).

In a tweet to his followers, Antony wrote: ''Me and @RosannaJasmin have some very exciting news... We are expecting our first baby, we really can't wait to be parents.''

Meanwhile, the mother-to-be posted an almost identical message on her own Twitter account.

Blue also helped break the news with a post on their official Facebook page.

In a statement on the social networking site, Antony's band mates and the group's management team said the news added to a ''wonderful Christmas'' for the pair.

The statement said: ''2014 is going to be a bumper year! Antony Costa & fiancé Rosanna Jasmin are pleased to announce they are having a baby.

''This completes a wonderful Christmas for the couple who announced their engagement on 23 December.

''Congratulations and best wishes from Duncan, Lee & Simon. And Paul, James, Amanda, Sarah & Sandra on the management team.''