Jennifer Aniston has once again shown her love for her "ridiculously special" friend Courteney Cox in honour of the mum-of-one's 57th birthday on Tuesday.Taking to Instagram Stories to mark the special occasion, Jennifer shared a throwback clip during their time together on hit sitcom, Friends.MORE: Jennifer Aniston reveals goddaughter's sweet nickname as she shares rare personal photoWATCH: Jennifer Aniston praises ex-husband Brad Pitt in new videoThe throwback footage, which played 50 Cent's