It pays to be a celebrity. Some of the famous guests who attended the lavish Mumbai wedding of Anant Ambani and Radhika Merchant earlier this month walked away with “over $3 million in freebies,” a source told US Weekly Thursday. A-listers including Kim Kardashian, Khloé Kardashian, Nick Jonas, Priyanka Chopra and John Cena were among those who attended the multi-day …