Pentatonix 'We are young' and Happy Birthday Kirstie Oxford 15 May 2014 By: Elo Mininelo

Singing Happy Birthday to Kirstie at the Pentatonix Show By: Elizabeth Cim

Pentatonix Singing Happy Birthday to Avi By: Bethany Loscher

Happy Birthday Pentatonix @ The Albert Hall Manchester 28 May 2016 By: Yorkshire Lass

Pentatonix Happy By: Pentatonix

Pentatonix Reaction Video Pentatonix Sings Happy Birthday To Me By: Hassan Ahmed

Happy Birthday Beautiful By: Pentatonix

PTX World Tour in Manila Happy Birthday By: Pia Patron