This is 15-year-old Keegan Carnahan. She babysits Alidy, a 3 year old, in Florida. Alidy loves mermaids. So Keegan decided to surprise her at bath time and dress up in a mermaid tail she got when she was 12 (she was "going through a phase").
Alidy's mom Jenna says her daughter is convinced that Keegan is a mermaid and now wants pink hair like Keegan. Jenna also says that this has brought her and her daughter so much happiness. Alidy has worn a costume every day since she lost her dad in November and this was the first time that someone matched her and gave her such a connection. Just look at her face! So happy!
No surprise that the internet is LOVING it!