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Selena Gomez posted the most adorable throwback picture of her 5-year-old self to commemorate Instagram's fifth birthday. "[A] photo of me the same age as Instagram is today, happy 5th birthday @instagram. Thank you for doing what you do x," the "Me & the Rhythm" singer captioned the retro photo [2] of her wearing a backward cap and eating ice cream on a rocking horse. Selena has used Instagram since its inception — most recently to promote her Revival tour [3], but also to post plenty of sexy photos [4] (this is probably the best one [5]), so it's a sweet gesture to the social media platform!