Selena on Instagram: Happy birthday to my number one

@selenagomez: Happy birthday to my number one. @pmdeleon22 cousins/sisters/therapists -I love you.

Happy birthday to my number one. @pmdeleon22 cousins/sisters/therapists -I love you.

A photo posted by Selena Gomez (@selenagomez) on Jan 3, 2016 at 6:39am PST