Watch this girl's hilarious (and mildly inappropriate) reaction to finding out she's going to be a big sister

(WITI) -- The Williams family was excited to reveal to Kathryn, who is almost three, that she's going to be a big sister. They bought her a book titled Hello in There!: A Big Sister's Book of Waiting as part of the big reveal. However, Kathryn stole the moment with her honest confession.

The video was posted on the someecards YouTube channel on March 19th and has over 500,000 views.