When Vikram married model, actress and former investment banker Priya Sachdev in 2006, both Clinton and Prime Minister Singh were on the guest list that also included steel magnate Lakshmi Mittal, model Naomi Campbell and Prince Nikolaos of Greece.
About 600 well-heeled guests from 26 countries were brought to India on chartered planes for the super-opulent Punjabi wedding.
Prime Minister Singh was seen congratulating the newly-weds with a bouquet of canary yellow flowers.
The marriage wasn't entirely a success, but it did give rise to some theories about Prime Minister Singh's relationship with Chatwal.
Some said the two knew each other well because their families came from the same village.
Debunking these theories, former Business Standard editor, Sanjaya Baru, who was media advisor to the prime minister in the first term of the UPA government, says, "He (Chatwal) does NOT know the PM 'well'. This is a canard spread by various people, including himself. He played an important role in getting Hillary Clinton to support the nuclear deal. He is close to the Clintons. That is why he got the Padma (Bhushan) award."
Baru, now director for geo-economics and strategy, International Institute for Strategic Studies, adds, "He is very influential in the US NRI world, so the prime minister chose to be nice to him because we needed NRI help to get the US Congress to support the nuke deal."
Image: Guests dance with the mother of Vikram Chatwal (L) at the latest party in the wedding celebrations of Vikram Chatwal , son of Indian businessman Sant Singh Chatwal and the unseen Priya Sachdev in New Delhi, late 17 February 2006.