One of the most important moments in a person's life can definitely be awarded to their wedding day. There are so many big and small details to smooth out, with one of the biggest being the first dance song. For one couple, they had the incredible experience of Shawn Mendes serenading them during their first dance.\nA video from a guest showed the 21-year-old Canadian on stage strumming his guitar and belting out Death Cab for Cutie's "I Will Follow You into the Dark."\nThe video was reposted by Capital FM on Twitter today. It got over a thousand likes, more than a hundred retweets, and dozens of comments from amazed fans.\nWho would you LOVE to sing at your wedding? 😱 @ShawnMendes pic.twitter.com/qypxiqqFuw— Capital (@CapitalOfficial) February 10, 2020\nAccording to Capital FM, the groom at the wedding was Mendes' photographer Josiah Van Dien who toured with him in 2018.\nA quick scroll through the Pickering-born singer's Instagram page shows Dien tagged for photo credit in tons of his snaps. Dien's Instagram notes that his new wife is Sami Leighty from Dallas, Texas.\nCapital FM also claims that the newlyweds "recruited viral yodelling sensation Mason Ramsey to be the ring bearer."\nA couple of guests snapped photos with the 13-year-old country singer, including The Dangerous Summer guitarist Matt Kennedy who also shared a video of Mendes' performance in his set of photos.\nView this post on Instagram Van Dien wedding // 2-7-20. Saw my friends get married. Met little hank. @shawnmendes played a song. We played some songs. I had some drinks and saw the ocean. 🍻🍻 #vivavandien A post shared by Matt Kennedy (@matthewtds) on Feb 9, 2020 at 2:41pm PST\nView this post on Instagram Rings bearer of the year goes to @masonramsey 💍. Kinda wish I could fly him to France when (if) I get married too. #vivavandien A post shared by Candice (@_candicepw) on Feb 8, 2020 at 12:47pm PST\nDien's Instagram page is filled with tons of creative shots of the "Señorita" singer. He even has a photo he took of Mendes and Ramsey together in Nashville last summer.\nView this post on Instagram Nashville A post shared by Josiah Van Dien (@josiahvandien) on Aug 3, 2019 at 7:41am PDT\nThe replies to the Twitter video were filled with fans who loved his performance including this person who "wouldn't wanna get married if he didn't."\nIn fact I wouldn't wanna get married if he didn't😩— 𝓐𝓶𝓮𝓵𝓲𝓪🦋 (@WhyAmeliaa) February 10, 2020\nAnother person "would get married just to have Shawn singing at my wedding".\nI would get married just to have Shawn singing at my wedding! 😍— Alice.In.Wonderland (@shineurlight97) February 10, 2020\nThis user's comment is one of the sweetest things you'll read today.\nI mean who wouldn't? 🥺♥️ I would probably close my eyes and enjoy his Beautiful voice ringing in my ears while slow dancing with my husband 🥺🥺♥️♥️— Angela (@shawmilizer_97) February 10, 2020\nThis isn't Mendes' first time singing a couple's first dance song at their wedding wrote Capital FM. It's so heartwarming to know he serenaded someone with such an important role in his life.