Britney Spears, 39, is about to gain a new sister-in-law! The pop star celebrated her recent engagement to handsome fiancé Sam Asghari, 27, with his sister Fay Asghari with a special night out. Fay, who indicates she works as a “Board Certified Cosmetic Injector” on her Instagram, shared a sweet photo of the trio smiling at a dinner table as a delicious creme brûlée dessert sat in front of them.