Harry Styles
Styles has also been linked to Kendall Jenner after the two were spotted enjoying themselves in the Caribbean islands of Anguilla in JanuaryReuters/Olivia Harris

Harry Styles was reportedly in a secret relationship with a US air hostess before the One Direction singer's short fling with model Kendall Jenner. Styles allegedly met Megan Smith when the band was jetting across US and Europe for their On The Road Again tour.

According to The Sun, Styles, 22, and Smith, 24, kept their "romance under wraps" while the two were on tour with One Direction between June and October 2015. The publication also claimed that Smith, who is a yoga instructor as well, flew to London to see Harry earlier in the year and had planned to meet the singer later this month.

"Harry and Megan first met on the plane when she was hired as one of One Direction's private air hostesses," a friend of Megan apparently told the publication. "They really bonded on the plane and things turned romantic quickly. They went on a number of dates and hit it off."

"But unlike many of Harry's flings, this actually got really serious. He supported Megan through some tough times in her life and started referring to her as his girlfriend," the source is reported to have said. "Megan never asked him about other women because she accepted he was a rock star but she was madly in love and believed Harry felt the same."

Styles has also been linked to Jenner after the two were spotted enjoying themselves in the Caribbean islands of Anguilla in January. On 19 March, a hacker by the name of @haarrystyles on Twitter, broke into Styles' mother's iCloud account and leaked private photos of him and Jenner enjoying their vacation in the Caribbean islands.

"There was nothing incriminating in them that could hurt him or his image, which means he's not really bothered personally," a source told HollywoodLife. "However, he's always been very protective of his mom and the fact that Anne has become the target of hackers does upset him. He's the famous one, so he expects to be fair game, but she's not in the public eye and that makes him angry that someone would mess with her," the source said.