We may receive a commission on purchases made from links. Beloved a cappella group Pentatonix has been on a whirlwind ride ever since making it big by winning "The Sing-Off" in 2011. Their success ...

By traveling with them, filming, and hanging out on off time, Hausdorff naturally bonded with all the Pentatonix band members, forming a particularly close relationship with Kirstin Maldonado.