Ermahgerd! Serena Williams is pregnant

Serena Williams is going to be a mamma! The tennis star has surprised fans with the news after posting a picture of herself sporting a baby bump.

Wearing a bright yellow costume, Serena posted a picture to SnapChat and used the caption "20 weeks."

The image has since gone viral.

Serena Williamsvia SnapChat 

Her fiance is Reddit co-founder Alexis Ohanian. He proposed in January and this is the couples first child together.

Of course the internet has already gone crazy about the news.

I just see Serena Williams as a mother and her kid is acting up and she's like "Don't Try Me..." https://t.co/juJzoQeKXS

— Erick Fernandez (@ErickFernandez) April 19, 2017

That means Serena Williams was pregnant when she won the Australian Open. A pregnant woman dominated them. pic.twitter.com/RoP5pLOY8j

— Kevin Simmons (@TheSkorpion) April 19, 2017