Kumar Mangalam Birla, Mukesh Ambani and Sunil Bharti Mittal: Billionaire brigade's milestone birthdays

It's a special year. Family, friends and well wishers join hands to raise toasts to three Indian billionaires who celebrate milestone birthdays this year.The one coming up soon is Kumar Mangalam Birla's 50th birthday on June 14.

Birla's big day was preceded by Mukesh Ambani, who turned 60 on April 19. Reportedly, the family used the occasion to make donations to hospitals and religious institutions. For wife, Nita's 50th birthday in 2013, the family was seen offering prayers in Varanasi. A grand party was hosted in Jodhpur later on.

The third big birthday will be that of Bharti Enterprises' Sunil Bharti Mittal, his 60th, on October 23. There are many congratulatory calls to be made .