Selena Gomez on Instagram: I am the luckiest, happiest girl today

@selenagomez: I am the luckiest, happiest girl today. Thank you guys so much for all the bday wishes!! I love growing up with YOU.

I am the luckiest, happiest girl today. Thank you guys so much for all the bday wishes!! I love growing up with YOU.

A photo posted by Selena Gomez (@selenagomez) on Jul 22, 2015 at 8:47am PDT