The One Direction star - whose dating Victoria's Secret model Barbara Palvin - caught up with the blonde beauty whose on the London leg of her 'RED' Tour on Sunday night (02.02.14) before she took to the stage at the 02 Arena.
An insider told the Daily Mirror newspaper: ''Taylor was happy to sort Niall some Access All Areas passes and even had drinks with him before the show.
''They met through mutual friend Ed Sheeran. Niall seemed like a genuine fan of Taylor's music.''
Following their split Taylor penned the track 'I Knew You Were Trouble' which she has admitted was about the curly-haired hunk and Niall ''smirked'' when she performed the song to her fans.
The source added: ''However, he smirked when she performed 'I Knew You Were Trouble' which was rumoured to be about Harry.''
Meanwhile, Harry who is reportedly dating model Kendall Jenner was in California where he celebrated his 20th birthday which fell on February 1.
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