[Photo by: Cartoon Network]

Imagine going through your entire life not knowing you had another sister, because that's how we feel finding out there's going to be a fourth Powerpuff Girl.

Check out all the details and when the new girl will be revealed below!

Read more: This website turns you into a Powerpuff Girl

Entertainment Weekly revealed the news regarding this mysterious fourth Powerpuff Girl, along with revealing a picture that shows the silhouette of this mysterious stranger. Check it out below!

[Photo by: Entertainment Weekly/Cartoon Network]

We're not really sure how to feel considering it's only been a trio since the show's creation in 1998, but now it appears that Buttercup, Blossom and Bubbles will possibly have a sister? How do you feel about this? Is this even okay?!

This mysterious Powerpuff girl will make her debut in the five-episode movie, The Powerpuff Girls: Power of Four, which will premiere on Sept. 17 at 5:30 EST on Cartoon Network.

Will you be watching? Let us know in the comments and let us know how you feel about a fourth Powerpuff girl!