JJ is celebrating the birth of his son

Union J‘s JJ Hamblett has become a father.

The ecstatic singer, 25, announced on Twitter this morning that he and his girlfriend Caterina Lopez have welcomed a baby boy named Princeton J Alexander.

‘Its official at 9 30am today I became a Daddy The healthy little boy has arrived at a weight of 6lb!!!!! soooo happy right now :)))) xx,’ Tweeted JJ

JJ met model Caterina – who’s related to Jennifer Lopez – when she was working in a nightclub and the loved-up couple now live together with their dog Lola.

They’ve been flooded with sweet messages since revealing their happy news.

‘@JJUJWorld congrats JJ mate!’ Tweeted One Direction‘s Niall Horan.

JJ‘s band mate Jaymi Hensley wrote: ‘@JJUJWorld is a Dad whoooop uncle Jaymi xxx.’

Union J‘s Josh Cuthbert said: ‘SOOO HAPPY for JJ and Cat!! Its an amazing day and couldnt happen to 2 more amazing people. Chuffed to bits. The baby is gonna be beautiful.’

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Anna Duff