Luke Bryan shares a sweet, “goofy” tribute to his wife Caroline on their 15th anniversary

Luke Bryan and his wife, Caroline, are celebrating 15 years of marriage today, and the singer celebrated with a social media tribute that showcased the couple's signature mix of sweetness and humor.

Anniversary or no anniversary, both members of the busy couple still have to work: Caroline's guest hosting on the E! Talk show Daily Pop today, and she replied to Luke's anniversary message with a joke about their busy schedules.

Earlier this year, the country star couple remembered their first meeting in My Dirt Road Diary, a documentary about Luke's life and career. They met as college students at Georgia Southern University at a bar called Dingus, and Luke describes the occasion as "love at first sight, college magic."

They married in 2006, and share two sons, Bo and Tate.