It's been claimed that the singer is expecting a baby with US stylist Briana Jungwirth, and American fans jumped at the chance to be the first to congratulate Louis on the news.
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Louis made no mention of the reports
Many concert-goers managed to put together baby-themed signs for the ‘On The Road Again’ tour night, though Louis didn’t actually discuss the rumoured pregnancy.
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'A TomlinSON or a TomlinDAUGHTER' - Nice.
Weirdly, just days before, one fan threw a doll on stage.
Louis - who presumably knew about the reports at the time - managed to shrug off the jokey incident, picking up the baby toy, before saying “this isn’t even real”, and flinging it back into the crowd.
Watch his reaction in this Vine (story continues below)...
The baby reports first emerged on Tuesday night, when sources revealed Briana’s “surprise” pregnancy.
“Louis is really excited about becoming a dad,” a source told The Sun. “Louis really cares about Briana and thinks she will be a great mum. Their friendship has got even stronger though this.”
Briana Jungwirth is being described as a stylist by US media outlets, but we've been doing some detective work and she doesn't seem to have a website or Instagram account. Hmm... (credit:AKM-GSI / Splash News)
(02 of09)
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Briana and Louis were first rumoured to be dating back in May 2015, after meeting through mutual pals in LA. They enjoyed a number of nights out together, attending swish parties, including one held by Snoop Dogg. (credit:AKM-GSI)
(03 of09)
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While the duo aren't currently a couple, they are close friends, and planning to bring up the baby together. A source tells 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.” (credit:FameFlynet.uk.com)
(04 of09)
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Briana went to her first One Direction concert in San Diego in on 9 July. When she met Louis, the stylist apparently wasn't a huge fan of the band.
(05 of09)
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Fans are in meltdown. In the hours after the baby news was revealed online, #OhNoLouis became the worldwide top trending topic on Twitter, as Directioners struggled to digest the news. (credit:AKM-GSI)
(06 of09)
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She's met his parents! According to reports, Louis's mum and dad flew out to the US for 4 July, taking the opportunity to meet Briana. (credit:Daniel Deme/WENN.com)
(07 of09)
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We can still see you, Briana! It's believed that Briana is 23 years old, and according to People she's a very private person, who won't be stepping into the limelight any time soon. (credit:FameFlynet.uk.com)
(08 of09)
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Louis could be relocating to the States. We always thought Harry Styles would be the first member of One Direction to make the move across the pond, but the baby news means Louis looks likely to snap a pad in California. (credit:AKM-GSI)
(09 of09)
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The baby will be Louis' mum Johanna's first grandchild. Aww! (credit:AKM-GSI)