The singer took to Twitter to share a black and white snap of him and his little boy, who he welcomed into the world last Friday, reported Femalefirst.
Captioning the sweet photo, alongside a baby emoji, he wrote: "Meet my little lad, Freddie."
Tweets flooded in to congratulate the star and the baby's mother Briana Jungwirth.
One fan wrote: "congratulations Louis for your son Freddie is beautiful omg so cuteeeeeee (sic)"
Whilst another shared: "so proud of you, welcome to the family Freddie (sic)"
Meanwhile, the 24-year-old singer is reportedly set to hand out over 2 million pounds in child support over the next 18 years.
