Beyoncé is clearly aware that a picture is worth a thousand words, which is why she usually leaves her Instagram photos captionless. However, she did make an exception in honour of her BFF Kelly Rowland [1]'s 38th birthday on Monday. "Happy Birthday Kelly! 🐘 I love you Deep Deep," Beyoncé wrote alongside an album featuring a series of adorable throwbacks. One of the pictures is a black-and-white school portrait of a smiley Kelly, but there are also a few of Kelly and Beyoncé over the years. The ladies have been friends since their Destiny's Child days [2], and it's obvious they share a sisterhood unlike any other. Happy birthday, Kelly!