The 23-year-old One Direction star is set to become a parent, People magazine claim, with his close friend Briana Jungwirth.
A mutual friend of the pair insists that while Louis and the stylist aren’t in a relationship, the singer will be a ‘hands-on dad’ when their baby arrives early next year.
The pair were introduced through mutual friends a few months ago following Louis’ split from his longterm girlfriend Eleanor Calder.
‘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,’ the source has told People.
‘They are both really happy and although they aren’t in a relationship, their friendship is extremely strong and they are both really excited about the baby. It’s early days and Briana and the baby’s health are the most important things right now,’ adds the friend.
A representative for Louis had ‘no comment’ on the report when contacted by MailOnline.
Louis was seen holding hands with the American beauty, also 23, in May during a night out in Los Angeles.
A source told The Mirror at the time of their relationship: ‘Louis is mainly in LA to work on 1D’s new album but he is also making sure he is having plenty of fun.
‘His friend gets on with her friend, so they’ve all been hanging out together. He is young and single, so why not?’
The pair were pictured on a night out at The Argyle in California in May before another night of partying days later at Project L.A. in Los Angeles.
Louis and the pretty stylist were also seen leaving Snoop Dogg’s CD release bash in West Hollywood holding hands in the back of their ride home.
Louis, who has spent much of his recent time off from the band in LA, is reportedly already making plans ahead of the birth, and has been on the hunt for properties near Briana in California.
The Brit singer’s mother Johanna and step-father Dan have also reportedly met Briana’s parents, with an insider claiming the two families enjoyed a July 4 weekend together.
Louis’ mum Johanna is a mother of seven and gave birth to twins Ernest and Doris in February 2014, but this will be her first grandchild.
News of the pregnancy comes just two weeks after Louis was pictured cosying up to model Tamara Bell at Glastonbury.
Louis’s impending fatherhood comes just four months after he split from Manchester University graduate Eleanor Calder after four years together.
His split with Eleanor was only made public when he was pictured kissing a brunette while on holiday in Thailand in March.
At the time, his rep said: ‘Louis and Eleanor split up two weeks ago. They have not announced this as they wanted some privacy during this time.’
It was also claimed that Calder flew 20,000 miles to Australia in a final bid to save her relationship with the star and work through their ‘differences’.
Since confirming he was single, Louis has been hitting the party scene hard and has regularly been photographed leaving nightclubs with a variety of pretty women.
In May, Fifth Harmony’s Camila Cabello was forced to deny rumours that she was dating Louis.