Little Mix is a musical group that was discovered on the UK version of "X Factor." They've made quite a splash on the music scene and have millions of fans all over the world, but you don't have to tell that to Gemma Crabbe, who is a huge fan. Gemma's sister Megan is a big deal on social media, spreading her body-positive message on Instagram.

Recently, Megan had the chance to be in Little Mix's newest music video, "Strip." Gemma had no idea, so Megan decided to let her sister know about the big news, with three of the members of Little Mix there with her. Gemma's mind was sufficiently blown, and she got to dance along with her music idols.