Niall Horan has reportedly been hanging out with Taylor Swift.

The One Direction star is rumoured to have attended her Red Tour show at the O2 Arena in London on Sunday, the second of her five UK dates.

According to British newspaper The Mirror, the two stars bonded before the performance, which might not go down well with Niall's bandmate Harry Styles, who used to date Taylor, 24.

"Taylor was happy to sort Niall some Access All Areas passes and even had drinks with him before the show," a source told the publication.

"They met through mutual friend Ed Sheeran."

Harry, 20, and Taylor started dating in October 2012 but broke up in January 2013.

The starlet is known for letting out her heartbreak in her music and all-knowing Niall apparently enjoyed having the inside scoop on her lyrics.

"Niall seemed like a genuine fan of Taylor's music. However, he smirked when she performed I Knew You Were Trouble which was rumoured to be about Harry," the insider revealed.

Taylor is thought to have headed back to her hotel to watch the Super Bowl on Sunday night.

While it's unknown whether Niall joined her, the singer did tweet about the sporting event but made no mention of the gig.

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