Former World No. 1 doubles tennis star Sania Mirza posted this picture with her younger sister Anam, who turned 23 yesterday. Anam married Hyderabad-based businessman Akbar Rasheed in November last year. Sania shared the picture with her 2.7 million Instagram followers and wrote: "Happy happy birthday to my best friend in the whole wide world. I love you. @anammirzaak."