Jennifer Aniston and Courteney Cox are incredibly close and have been real-life best friends ever since meeting on the set of Friends in the nineties.MORE: Jennifer Aniston feels extremely lucky after health updateThe Rachel Green actress is godmother to Courteney's daughter Coco, and showed her support for the teen's incredible singing talents in a new video posted on social media.In the footage, which was shared on the Monica Gellar star's Instagram account, Coco was captured singing Taylor