Shailene Woodley and Theo James Sizzle at ‘Insurgent’ World Premiere (Photos)

“Divergent” sequel co-stars delight fans in London, as Woodley goes backless in a glamorous gown

Last Updated: March 11, 2015 @ 10:47 PM

No one said being a movie star is glamorous all the time, and that’s especially true for the stars of the futuristic sequel, “Insurgent.”

While the actors looked amazing on the red carpet at the film’s world premiere Wednesday in London, Shailene Woodley and Theo James admitted filming the follow-up to 2014’s “Divergent” was brutal at times.

“It was loads of fun. The thing about this film is it looks like [we are running for] seven minutes but in reality, we were running for two months,” Woodley told the Irish Independent.

Shailene Woodley attends the World Premiere of 'Insurgent' at Odeon Leicester Square on March 11, 2015 in London, England. (Photo by Dave J Hogan/Getty Images)

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Being winded was the least of James’ concerns. “I got hit in the face during the train sequence so I got clocked, but the film makes you feel tough,” the British actor joked.

While she plays leather-clad tomboy Beatrice “Tris” Prior in the film based on Veronica Roth‘s YA novel, Woodley wore a sophisticated ivory Ralph Lauren Collection gown with an open back to the event at the Odeon cinema in Leicester Square.

James, who plays love interest Tobias “Four” Eaton, was equally dashing in a Dolce and Gabbana suit.

LONDON, ENGLAND - MARCH 11: (SUN NEWSPAPER OUT. MANDATORY CREDIT PHOTO BY DAVE J. HOGAN GETTY IMAGES REQUIRED) Douglas Wick, Veronica Roth, Theo James, Shailene Woodley and Lucy Fisher attend the World Premiere of 'Insurgent' at Odeon Leicester Square on March 11, 2015 in London, England. (Photo by Dave J Hogan/Getty Images)

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Set in a future-dystopian world where a micro-society has been divided into factions, Tris (Woodley) is a “divergent,” someone whose innate abilities place her into more than one of those categories. Following the massacre of her parents and the other members of the altruistic Abnegation faction, Tris — along with boyfriend Four (Theo James) and the not-entirely-trustworthy Peter (Miles Teller) — are hiding out from wickedly ambitious Jeanine (Kate Winslet) with the gentle souls of Amity.

Octavia Spencer, Naomi Watts and Ansel Elgort also star in “Insurgent,” which opens in the U.S. on March 20.