One Direction were men in black at the 'Men in Black III' premiere. The Brit heartthrobs donned coordinating black and white outfits ... and guns!

The adorable blokes brought along Nerf guns, which they reportedly used on photographers. Cheeky! The 'What Makes You Beautiful' singers took in the Will Smith film at the Ziegfield Theater in New York City, tweeting about what an awesome time they all had. (We're guessing no one got slapped at this junket, but there may have been a rap battle or two.)

Liam Payne wrote, "mib3 was amazing go nd watch it met a lot of cool people tonight had a great time." He also tweeted the star's daughter, 'Fireball' rapper Willow Smith. "@OfficialWillow hey it was really good to meet you sorry we got cut off couldnt find you in the cinema after, looking forward to the film x." So sweet!

The guys went stag to the premiere. Heartthrob Harry Styles was cougarfree for the event, and the guys with girlfriends -- Liam Payne, Zayn Malik and Louis Tomlinson -- didn't bring them along for the guys' night out. The band are kicking off their North American tour tonight in Fairfax, Va., so perhaps it was their means of a kickoff party, complete with weapons, aliens and movie stars. Not a bad way to start out a recordbreaking arena excursion!