The couple threw an exclusive theme party with a mini fair and fireworks for the guests.
Mukesh and Nita Ambani's son Akash Ambani and bride-to-be Shloka Mehta are in Switzerland with their close friends and family.
The couple hosted a lavish party for over 200 guests including socialites and celebrities from Bollywood.
The pictures of the winter wonderland celebrations will make your jaws drop.
IMAGE: 'And here's the exclusive shot of Shloka and Akash at the pre-wedding party of the Ambani clan in St Moritz Sunday night,' Ruth Spitzenpfiel, one of the guests wrote on Instagram. Photograph: Kind courtesy Ruth Spitzenpfiel/Instgram
IMAGE: Ruth also shared this picture of Mukesh Ambani with daughter Isha Ambani ready to welcome guests. Photograph: Ruth Spitzenpfiel/Instagram
IMAGE: Ruth posted this picture giving us a sneak peak of the winter themed adventure party. Photograph: Ruth Spitzenpfiel/Instagram
IMAGE: The celebrations ended with massive and colourful fireworks. Photograph: Kind courtesy Ruth Spitzenpfiel/Instagram
IMAGE: The guests were accommodated at Kulm Hotel, Badrutt's Palace and Grand Hotel Des Bains in Switzerland. A London based lifestyle brand shared some pictures what looked like gifts for the guests. Photograph: Kind courtesy Amishi London/Instagram
IMAGE: The custom bags are designed by London based Amishi Dhanuka. Photograph: Kind courtesy Amishi London/Instagram