Ellen DeGeneres: Watch Out Niall Horan!

Niall Horan plays it cool behind sunglasses as he arrives at a rehearsal space on Thursday (January 31) in London, England.

The 19-year-old One Direction member and his band mates – Zayn Malik, Liam Payne, Louis Tomlinson, and Harry Styles – are gearing up for their big 2013 world tour.

PHOTOS: Check out the latest pics of Niall Horan

Earlier in the day, talk show host Ellen DeGeneres warned Niall that she might be sending him something special in the mail.

“I got so many great busts of myself, I’m gonna start sending them to other stars they could be. Heads up @NiallOfficial” she tweeted, along with a photo of a paper-mache head. Hilarious!

15+ pictures of Niall Horan arriving at rehearsals…