It's been reported by US magazine People that the 'Best Song Ever' star is expecting his first child with US-based stylist Briana Jungworth.
A source told the US mag: "Louis is happy and very excited about becoming a dad and he thinks Briana will be an amazing mother. It was a surprise at first, but he and Briana are very, very close friends and this has brought them even closer."
Multiple outlets have reported Louis' rep has declined to comment.
Louis, 23, is said to have met Briana after his split from long-time girlfriend Eleanor Calder. They aren't in a relationship but have struck up a close friendship, according to reports.
People magazine's source has said parents of both families met in the US recently and are excited about the new arrival.
Louis has not referenced the reports on Twitter yet.