Union J star JJ Hamblett's girlfriend has shared an ultrasound of their baby.

The British boy band heartthrob announced he and model Caterina Lopez are expecting their first child earlier this week, and the brunette beauty gushed about their impending bundle of joy as she posted a scan of the ''little monkey'' on Instagram.

She captioned the picture: ''Someone looks extremely comfortable ... Our little monkey ! (sic)''

It looks as though Caterina's pregnancy is already causing her discomfort as she complained of being unable to sleep in the early hours of Friday morning (20.09.13).

She wrote on Twitter: ''I have a very active baby kicking up a storm at 1am .. it seems to be loving this Honey Boo Boo episode that's on #dontaskwhyimwatchingher (sic)''

'Carry You' hitmaker JJ, 24, shared the couple's joyous news on his Twitter account earlier this week, revealing he is excited about becoming a dad for the first time.

He said: ''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

''My girlfriend and I are super super excited and the boys cant wait to be uncles! They are already thinking of names begining with J lol :-) x (sic)''

The hunky singer shot to fame on 'The X Factor' in 2012 along with his Union J bandmates Josh Cuthbert, Jaymi Hensley and George Shelley.

The trio all welcomed their pal's exciting news, with George - who was recently linked to US pop starlet Selena Gomez - writing: ''JJ THE DAD! So proud of you brother. It's going to be the most gorgeous baby ever! Can't wait to teach it guitar! Hang on... NAPPIES! Eww ;)''

Josh added: ''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)''

Finally, Jaymi wrote: ''Congrats JJ & Cat - gonna be an uncle whoop (sic)''