By Connie Bowker Rihanna left critics less than impressed with her highly anticipated performance at an Indian billionaire’s wedding. After the news broke that the 36-year-old global megastar was being paid $6.3 million (£4.9 million) for her performance on Friday night, fans were expecting her to pull out all the stops. Anant Ambani – the son of Mukesh Ambani, the richest man in Asia – and his bride had booked Rihanna to perform at their extravagant three-day pre-wedding celebrations and forked out a hefty fee for her appearance. Sadly for the happy couple, Rihanna’s concert fell short of exp…