Any duet songs for two 11 year old girls (re-written question)?

my sister is doing a talent show and she needs a song to do, she wants a pop song (can be slowish) from the past few years (from 2009 onwards). they want it to be along the lines of hot and cold, girl put your records on or Valerie. if your wondering why it was removed before she did it as herself using my account and they thought she was 11 and you have to be 13 to write a question. thanks in advance :D