Britney Spears shared a cryptic photo of a shirtless mystery man whom she bizarrely claimed was her uncle.The “Toxic” singer’s Instagram post Tuesday featured a guy wearing only a pair of gray basketball shorts as he snapped a selfie to show the reflection of his muscled back in a mirror.The man, whose face was mostly obscured, has short brown hair, some facial stubble and a sharp jawline. He also wore a gold chain necklace.“This is my uncle 😉 !!! What if his back is my face 🤔🤔 ???” Spears strangely captioned the picture.However, all of her parents’ brothers are much older than the...…Britney Spears shared a cryptic photo of a shirtless mystery man whom she bizarrely claimed was her uncle.The “Toxic” singer’s Instagram post Tuesday featured a guy wearing only a pair of gray basketball shorts as he snapped a selfie to show the reflection of his muscled back in a mirror.The man, whose face was mostly obscured, has short brown hair, some facial stubble and a sharp jawline. He also wore a gold chain necklace.“This is my uncle 😉 !!! What if his back is my face 🤔🤔 ???” Spears strangely captioned the picture.However, all of her parents’ brothers are much older than the...WW…