Credit: Jason Mesnick on Twitter Photo: Riley Mesnick's Reaction to Kim Kardashian's Baby Being Born

The world was shocked when Kim Kardashian and beau Kanye West welcomed their bundle of joy nearly 5 weeks early on Saturday — but no reaction was cuter than that of Riley Mesnick. Jason Mesnick and Molly Malaney's baby girl offered up the most adorable reaction to the big news, and we have daddy Jason to thank for the photo.

Riley looks extremely happy — albeit slightly sleepy. She even spit out her pacifier in shock! But if you were on the fence about her reaction, that smile says it all.

Riley is an expressive little girl who is known to wear silly hats, watch sports with dad, share eskimo kisses with her big brother Ty, and make some of the best reaction faces. Seriously, if we could just get Riley's reaction to every big entertainment news story, it would be fantastic.

Need to feed your desire to see more reactions from Riley? Check out this slideshow of the most adorable Bachelor baby EVER. Riley, you have our hearts. Jason and Molly, keep posting pictures of Riley, okay?

Source: Jason Mesnick on Twitter