Thought celeb BFFs Selena Gomez and Taylor Swift were having a feud?

Looks like they mended their friendship!

Yesterday in honor of Selena's 22nd birthday, Swift posted an Instagram pic of her wearing an 'S' necklace with the caption, "Usually this S represents 'Swift' but today I'm wearing it because SELENA IS 22!!!!"

Could the Jelena split up possibly play a part in their truce?