Selena Gomez had a very sweet Instagram message for Taylor Swift's birthday

Friends send friends messages on Instagram for their birthdays. That's just, like, the law.

SEE ALSO: Taylor Swift reinvents herself (again) for her first Vogue cover of the Reputation era

It was Taylor Swift's birthday Wednesday and you'd better bet her friend Selena Gomez had nice stuff to say about it.

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Friendship abounds.

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