It doesn't get any sweeter than this.
In the multi-shot pic, Selena, Taylor and two other girlfriends are shown dancing, laughing, icing cupcakes and playing the guitar.
"Because you need a best friend [that] sings beautifully, another best friend to dance with you and another to listen," Selena, 19, wrote. "Oh and cupcakes…Cupcakes"
Too cute. Who doesn't love a girl's girl...and cupcakes?