Echosmith Are The 'Cool Kids' On 'The Tonight Show'

Sydney Sierota of Echosmith takes center stage while performing on The Tonight Show Starring Jimmy Fallon in new York City on Thursday night (November 13).

Along with her brothers, Graham, Noah and Jamie, the band sang their hit “Cool Kids” track on the program.

“Hey @jimmyfallon we love you and you really made us feel at home here in @NYC . Let’s be BFF’S!” the band tweeted afterwards.

Later on, Echosmith headed over to Vh1′s You Oughta Know Live in Concert, where they also performed “Cool Kids”. Check out their perforamnce below!