One Direction may be international superstars, but even they get star struck by celebrities. Niall Horan admitted recently who makes him nervous in the spotlight.

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"Sports people make me really star struck," Horan admitted to Cosmopolitan UK on Monday. "The other day I was lucky enough to play tennis with Novak Djokovic and I was horrendous obviously." Djokovic is currently rated no. 1 in the world and playing in the US Open.

"I've played about two hours of tennis in my life, but that was sick," Horan continued.

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What else does he like to do when he's not working? "I like stuff like literally sitting there watching telly playing the guitar. I like my own company," he said. 1D band mate Liam Payne also added he likes going "undercover" when he's not working, such as a recent NYC trip to FAO Schwarz.

Horan, Payne and the rest of One Direction are currently taking a short break from their North American Where We Are tour. The band has been busy since the beginning of August touring the North East.

Although the band always looks coiffed on stage, Horan admitted that he can't do his own hair to save his life.

"I can never do my own hair," Horan admitted. "If I have to go out at night I usually end up wearing a hat of some sort, so I stay away from that problem." Payne revealed it's not a problem for him, since at this current stage, the boy band singer has no hair.

One Direction's next tour stop is Pasadena, CA at the Rose Bowl on September 11.