Photo: WENN - All rights reserved.

Armie Hammer

Armie Hammer has dropped some major hints about the gender of his baby.

The American actor and his wife Elizabeth Chambers announced they are expecting their second child earlier this month (Sep16), a sibling for their 21-month-old daughter Harper.

During an appearance on Jimmy Kimmel Live! on Thursday night (29Sep16), Armie shared that he already knows the sex of the impending arrival, which is due "next year".

"You can find out (the gender) now at nine weeks, which is really bizarre," he told host Jimmy. "They do a blood test. They test if there are hormones in there. They go, 'Oh, you've got testosterone"so you've either got balls or you're having a baby boy.'"

And with a surname like Hammer, The Lone Ranger star remarked that he had tread carefully when deciding upon the new baby's first name.

"We're thinking Jack," he joked, adding that he could also christen the baby, "Michael Charles, and he can just go by M.C.," in reference to hip hop artist M.C. Hammer.

"Are you really thinking about that?" Jimmy then asked Armie. To which the star replied, "I think I just gave away our baby name? I'm in so much trouble!"

Since becoming a father in late 2014, Armie says parenthood has been a breeze for the most part. But the 30-year-old added that he wasn't sure if Harper was merely an "easy" child, or if he and his wife had been "winging it the right way" so far.

"So, we're just kind of going with it. I guess the only reason we're all here is because raising babies works. I think people"especially new parents, at least I did"sort of underestimate the resilience of human survivalism. Like, this thing is going to survive. That's the only reason it's here," he laughed.