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Ed Sheeran turned 25 on Wednesday, February 17. His BFF Taylor Swift was only one of a bunch of people sending him birthday messages, but the former country diva's heartfelt message was definitely the best.

Swift posted on Instagram that day a picture of Sheeran accepting his first-ever Grammy. In the lengthy caption, she congratulated him on his success and recalled the first time she heard "Thinking Out Loud", the song which earned the Brit the Song of the Year and Best Pop Solo Performance trophies at the awards show earlier this week.

Looking back on the highlights of my life, there's a moment I'll never forget from a day in London about two years ago. I was in town to play the O2 and I was out shopping on my day off. My friend Ed Sheeran met up with me in this little shop where I was buying ballet shoes. He walks in and says "you have to hear this new song. I think it's the best one I've ever written." And then, as usual, he pulls out his phone and gives me headphones. I sat there on a bench in that store and heard 'Thinking Out Loud' for the first time, as little kids were picking out tutus and leotards next to us. Little did we know it would go on to be first dance song at countless weddings all over the world, become Ed's biggest hit, and eventually go on to win him Song of the Year at the 2016 Grammys. Ed and I had been on tour together all year on the Red Tour and we saw each other almost every day. I lived for the moments he would burst into my dressing room with a new song to play me. It happened so often that it became normal, and I don't think he ever knew how much it meant to me that he wanted me to hear his songs first. I don't think he ever knew how inspired I was by his drive and passion to constantly create new art. But it's his 25th birthday today, so I'm saying it now. You deserve everything you have, and everything you will continue to achieve, Ed. And an extra congratulations to the incredible Amy Wadge on your two Grammys.

A photo posted by Taylor Swift (@taylorswift) on Feb 17, 2016 at 6:09pm PST

"Looking back on the highlights of my life, there's a moment I'll never forget from a day in London about two years ago. I was in town to play the O2 and I was out shopping on my day off. My friend Ed Sheeran met up with me in this little shop where I was buying ballet shoes," she wrote.

"He walks in and says, 'You have to hear this new song. I think it's the best one I've ever written.' And then, as usual, he pulls out his phone and gives me headphones. I sat there on a bench in that store and heard 'Thinking Out Loud' for the first time, as little kids were picking out tutus and leotards next to us," she continued. "Little did we know it would go on to be first dance song at countless weddings all over the world, become Ed's biggest hit, and eventually go on to win him Song of the Year at the 2016 Grammys."

Swift went on revealing how she got inspired by the moments she and Sheeran shared while he was supporting her "Red" tour a few years ago. "He would burst into my dressing room with a new song to play me. It happened so often that it became normal," she shared. "And I don't think he ever knew how much it meant to me that he wanted me to hear his songs first. I don't think he ever knew how inspired I was by his drive and passion to constantly create new art."

"But it's his 25th birthday today, so I'm saying it now. You deserve everything you have, and everything you will continue to achieve, Ed," she added and concluded the message with a shout-out to Amy Wadge who co-wrote "Thinking Out Loud".