Gallery: This Teen Gets The Award For Best Babysitter Ever For Dressing Up Like A Mermaid

Twitter is all tears after this babysitter did something awesome for the little girl she watches. 

15-year-old Keegan Carnahan is a babysitter in Florida. She watches 5-year-old Alidy, who likes to wear her mermaid costume for bath time. That's when Keegan got the idea to bring out her own tail from her childhood to play dress up with Alidy. 

The little girls face was pure joy. 

The post blew up on Twitter and the Internet fell in love with Keegan for her awesome babysitting skills. But the story gets sad when Keegan explained to Buzzfeed News that Alidy has dressed up in costumes since her dad died in November. 

Keegan said this was the first time anyone had played dress up with Alidy and it definitely made an impact. She now thinks that Keegan really is a mermaid and wants pink mermaid hair just like her. 

Awweeee! Twitter is still going crazy over the moment and a lot of them captured just what we were all thinking: