Caylor (apologies) have always struck a good balance when it comes to showcasing their relationship. They post the (very) rare shot of each other to Instagram - and that's about it. Otherwise, they keep a relatively low profile, which is pretty impressive given their respective levels of fame. 

Last night, Harris - brimming with pride for obvious reasons - posted the below to his Instagram entitled "Congratulations to my beautiful girlfriend."

While Taylor brought Selena Gomez as her date for the evening, Calvin reportedly hooked up with his missus at the Grammy after parties. According to Time Magazine: "At the Republic Records after party held at Hyde in Los Angeles, the cute couple - who have been dating for nearly a year - was spotted showing off some PDA. 'She was sitting on his lap and they were super affectionate,' says an onlooker. 'There was a mob of people around them'."

Taylor, meanwhile, has been basking the her three wins from the night, and the positive feedback she's received after that acceptance speech...