However, One Direction fans have spent the past year cultivating a conspiracy theory that suggests the baby is either a doll or doesn't actually exist at all.
The theory goes as far back as May last year, when a Twitter account was created with the username @BrianaFacts.
Two days later, Louis and Briana were pictured leaving a club together. Fans have tracked down a paparazzi video from that night, where at 29 seconds a paparazzo can be heard saying: "This one's for The Sun."
Sure enough, this was the image The Sun used on their front page when they confirmed the pregnancy two months later.