'Meet my little lad, Freddie!'

And added his gratitude to his fans for their well wishes: 'Thank you so much for the all nice messages :)'.

 Meanwhile, Briana also shared a photo of the baby boy on Instagram, revealing that his middle name is Reign.

 The picture showed the little boy bundled up in her arms as she lay in a hospital bed, and she captioned it: '1/21/16. Freddie Reign. Love of my life.'

 Fans had reportedly speculated before Louis revealed his son's moniker that he'd named the boy Sydney Rain.

 However, on Wednesday he dispelled such talk, revealing that he and his ex girlfriend Briana Jungwirth had settled on a much more traditional name for the child.

 Louis proudly confirmed the birth of his son on Saturday, after rumours of the birth were spread online by his loyal fans over the previous 24 hours.

 The excited star posted on Twitter: 'I'm pleased to say my baby son was born yesterday :) He is healthy and pretty amazing, I'm very happy!!'

 He then indicated he was relishing his new status as a parent as he added: 'Daddy daddy cool,' moments later.

 And as if his happiness wasn't evident enough, he followed his latest comment up with three smiley faces which appeared as ':) :) :)', on his personal account. 

Despite claims the One Direction star was splashing out on a multi-million pound pad for Briana and their son, TMZ have reported that Louis is leasing a much more modest three bedroom home in Calabasas for the two.

The report claims 'the home is in the hundreds of thousands of dollars ... not in the millions,' while stylist Briana has been paying for furniture.

 Louis meanwhile is renting his own home nearby for at least the next six months so he can be close to his son, with previous reports suggesting his five-bed mansion is worth £10million.

 It's not yet known if Louis and Briana has settled on a child support figure yet with The Sun claiming this week that the Brit singer will 'pay more than £2.1million in child support.'

 The paper reports that the star has agreed to pay almost £10,000 a month for his son, although it's noted that child support payments in California are based on income and the child's needs.

 The 1D star was pictured going to meet his pride and joy as well as his former flame in Calabasas, along with another friend on Monday, stopping by Briana's modest-looking apartment.

 Louis is now dating new girlfriend Danielle Campbell, 20, with the pair spotted out and about on several occasions together in Los Angeles over the last few weeks.

Recently, a friend of Louis' exclusively told the MailOnline that singer is planning to be a hands-on dad and support Briana in any way he can, despite being in a new relationship with Disney star Danielle.

 The pal said: 'Although they're not romantically involved, Louis thinks Briana is a great woman and will be a fabulous mother.'  

 Daily Mail