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Shailene Woodley, Theo James

Marion Curtis/startraksphoto.com

We are loving Shailene Woodley's style for these Insurgent premieres.

After flaunting some sexy back in London, the actress continued to heat up the red carpet in New York for the movie's premiere at Ziegfeld Theater by rocking a black Ralph Lauren dress with a plunging neckline that revealed some major cleavage. Once again, Woodley paired the look with a simple hairstyle and minimal makeup, making her overall appearance flawless.

Shailene's arm candy was pretty hard to miss, as well. Her co-star Theo James looked handsome as ever in a fitted suit and his signature brooding facial expression and scruff that we can't help but love.

E! News caught up with the duo's fellow co-star Ansel Elgort and chatted with the Hollywood cutie about his recent birthday bash. "I had a birthday party with all my family and friends at a house and Chipotle catered, it was beautiful. Then we all got on the party bus to Pacha in New York City and then Ansolo deejayed, and I am Ansolo by the way, and we had a crazy party and it was a lot of fun and that's it."

Ansel Elgort

Jamie McCarthy/WireImage

Shailene was unfortunately unable to attend, however. "He invited me but I just came back from Europe and I was exhausted and jet-legged," she tells us. "I felt like a total d--k for not going but I got him a card!"

Elgort opened up about his relationship with Woodley Seventeen's April 2015 issue, explaining that two, who shared an unforgettable onscreen romance in The Fault in Our Stars, have a wonderful, strictly platonic friendship.

"If a woman is really pretty, it's kind of hard. I'm not going to lie. Actually, that's not true," Elgort said. "Me and Shailene have a really platonic relationship. I've never once wanted her sexually, which is nice. But for me, if a person is someone I'm attracted to, and she's my best friend, hopefully we're dating."

Catch all of these stars and more when Insurgent hits theaters this Friday!

—Reporting by Jennifer Cooper