Taylor Swift's engagement ring. (Taylor Swift/Instagram)Our favorite mastermind is finally getting her fairytale ending - and she's got a massive rock to prove it.When Taylor Swift and Travis Kelce announced their engagement in a joint Instagram post on Tuesday, fans immediately flocked to social media to gush about the sizable diamond on her ring finger.The lovestruck footballer proposed to The Life of a Showgirl hitmaker with a ring he designed with Kindred Lubeck of Artifex Fine Jewelry. The stone, per Vogue, is an old mine, brilliant-cut diamond bezel-set in gold.