Harry Styles, Barry Keoghan all smiles at 'Dunkirk' premiere

July 19 (UPI) -- Harry Styles, Barry Keoghan and Dunkirk's other young stars were all smiles on the red carpet Tuesday.

The 23-year-old British singer and 24-year-old Irish actor attended the movie's New York premiere with co-stars Jack Lowden, 27, and Aneurin Barnard, 30.

Director Christopher Nolan and veteran stars Cillian Murphy, James D'Arcy, Kenneth Branagh and Mark Rylance were also present at the event. Styles shared his excitement in an interview with Entertainment Tonight.

"It's definitely a lot of fun," the One Direction singer said of the premiere. "I've already done the work part, so this is definitely the fun bit. We're all super proud of the film, so this is definitely the exciting bit for us."

Dunkirk follows the evacuation of Dunkirk in Operation Dynamo, which took place in 1940 during WWII. The film also stars Fionn Whitehead, Tom Glynn-Carney and Tom Hardy, a frequent collaborator of Nolan's.

"We clicked really easy [on set]," Keoghan said of his co-stars in an interview with Collider published Monday.

"I think there was no ego on set," Whitehead, 20, agreed.

Dunkirk opens in theaters Friday.