Ryan Reynolds just confirmed the sex of his second child with Blake Lively.

He’s been holding out on us for over a month now, by Ryan Reynolds has finally revealed the sex of his new baby.

The actor's partner, Blake Lively gave birth to the mysterious little bub at the end of September, giving a sibling to their 22-month-old daughter James.

Watch: Ryan Reynolds and other celeb dads nailing fatherhood. Post continues after video.

Video via Mamamia.

But the couple has stayed impressively (and frustratingly) tight-lipped on its gender.

Until now.

Reynolds spilled the beans on The Conan O'Brien Show, though in an indirect manner.

"Two under two is tough," he told the host, before adding, "Yeah, a lot of oestrogen. It's like an American Girl doll took a s**t on my life."

Yep, it's A GIRL!

We suspected as much. I mean, the Deadpool actor did accidentally let slip on social media last month, when he tweeted, "The mobile above my daughter's crib is just a whole bunch of NuvaRings. So she remembers how lucky she is."

Still no word on the name they've chosen for James' little sister. But rest assured we'll keep a close eye on Ryan Reynolds' Twitter feed...

Feature Image: Getty.