We're not sure about the granddad hat... but Calum's clearly been ADORBS his entire life! #SoSweet This image appears in the gallery:REVEALED! 21 MUST-SEE Pics Of Our Jingle Bell Ball 2014 Line-Up Before They Were Famous 8. We're not sure about the granddad hat... but Calum's clearly been ADORBS his entire life! #SoSweet Picture: Instagram 21 images See the full gallery: REVEALED! 21 MUST-SEE Pics Of Our Jingle Bell Ball 2014 Line-Up Before They Were Famous