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8 November 2012, 13:30 | Updated: 8 November 2012, 13:34
The 'Gotta Be You' singer says his kiss with the US star was "amazing and very purple".
One Direction star Niall Horan has hailed Katy Perry as the "sexiest" person he has ever kissed and joked that their famous kiss at the MTV Video Music Award earlier this year won't be topped until he marries her.
The 'What Makes You Beautiful' was given a kiss by 'Teenage Dream' star Katy when she presented them with their MTV award over the summer, and Niall has admitted it was an "amazing" kiss.
"Katy Perry!" Niall said in the December issue of Cosmopolitan magazine, when asked who the sexiest woman he has ever kissed is. "It was amazing and very purple - she had purple lipstick on.
"I don't think there will ever be anything cooler than kissing her," Niall added. "Until I marry her maybe!"
Check out One Direction's new cover for Cosmopolitan magazine below (Credit: Cosmopolitan/Ben Riggott):
The 'One Thing' singer also commented on the regular rumours he is dating The X Factor UK judge Tulisa Contostavlos, and says they are just good friends who like to hang out.
"I've got loads of good female friends, like Tulisa, but every time I'm pictured with her people say we're going out," Niall explained. "I don't really have a type, but for banter she's brilliant. She loves playing PlayStation. Tulisa is cool as f**k."
One Direction released the video for their new single 'Little Things' last week and will launch new album 'Take Me Home' on 12th November.
Full behind the scenes videos from One Direction's December Cosmopolitan shoot can be viewed here and the issue is out now.