Boy band star JJ Hamblett has revealed that his girlfriend Caterina Lopez is pregnant with their first child.

The Union J singer (you know the ones from last year's X Factor who were a bit like One Direction) made the announcement on Twitter yesterday.

JJ with his girlfriend Caterina (image via Twitter). 

“Guys I want you to be the first to know that I’ve got some big news... I’m going to be a daddy.... :-) :-) wooop x”, he wrote before adding that everyone is overjoyed by the news.

“My girlfriend and I are super excited and the boys can’t wait to be uncles! They are already thinking of names beginning with J lol :-)x”.

With his band mates: Josh Cuthbert, George Shelley and Jaymi Hensley.

It wasn’t long before the congratulatory messages started pouring in for 25-year-old pop star and Caterina who also have a dog called Lola.

JJ’s band mate Josh Cuthbert tweeted: “SUPER DOOOPER WOOOOPER HAPPY FOR MY BROTHER JJ :-) :-) :-) :-) hi my names Uncle Josh....... just call me Uncle.Pidge. :p hehe! Love you bro x [sic]”.