British actor Theo James is proud about the growth of his "Allegiant" co-star and on-screen girlfriend Shailene Woodley ahead of two more movies together as lovers in Four and Tris.

Theo James talked to E! News and he was asked to comment regarding Shailene Woodley's growth.

But he couldn't help but joke about the physical appearance of the "The Fault in Our Stars" actress from the time they did their first movie together to the third installment of the franchise.

So how did Shailene Woodley grew?

"Rack!" he quipped, referring to her breasts.

Getting more serious, Theo James said, "Have I seen her grow? I mean, yeah.'"

More than Shailene Woodley's growth, Theo James noted that they are becoming more comfortable around each other which takes the edge off their intimate scenes, although he admitted that alcohol helps in "hard-core" scenes.

"With this, it's OK," he said, referring to "Allegiant." "Because at the end of the day it's going to be PG-13."

"Sometimes the most awkward thing is [when] you're shooting and you're doing something, and then something has to be tweaked, so you can't move, but you're right there. So you're like, 'What's up?' And you're completely naked, covered in sweat," the 30-year-old actor added.

It does seem weird to be naked in front of everybody else for the actor vaunted for his privacy.

In an earlier interview with Flaunt, the "Allegiant" actor, who's dating actress Ruth Kearney, revealed that he purposely eschews social media.

"I don't have it and I never will," he said. "Other actors I know are really good at it and they rock and roll it, but it's not for me. If I post a picture of us having a drink now and get loads of views or comments and stuff, then suddenly you're quite exposed and you're in a world of work. I just like being present."