Ambani pre-wedding party guests arrived in jungle-themed attire to honor Anant Ambani's Vantara animal rescue center

• Mukesh Ambani is hosting a pre-wedding bash for his son, Anant Ambani and fiancée Radhika Merchant.

• Guests of the grand affair donned jungle-themed attire in the name of Anant's animal rescue efforts.

• Partygoers wore outfits featuring Indian giant squirrels, tigers, cheetah prints, and more.

Asia's richest man is throwing a huge pre-wedding bash for his son, and the world's richest celebrities and stars are attending.

Mukesh Ambani, the chair of Reliance Industries, is hosting a three-day celebration in honor of the upcoming wedding of his son, Anant Ambani, to Radhika Merchant, a healthcare heiress.

Guests attending the celebration in Gujarat, India, wore jungle-themed attire to pay tribute to the younger Ambani's passion for his animal rescue center. Here's what they look like.

A spotlight on endangered species.

Bollywood actor Ranveer Singh wore a floral shirt with a tiger on it. Singh attended the event with his wife, Deepika Padukone, who is also an actor.

Endangered animals, such as tigers, are the focus of Ambani's rescue center, which is called "Vantara." The name means "Star of the Forest," according to The Associated Press.

The bride-to-be donned cheetah print.

Merchant, whose father Viren Merchant is the CEO of Encore Healthcare, was seen in a blue cheetah-print dress with a matching hat. She looked gleeful and radiant posing with her future mother-in-law, Nita Ambani.

Cheetahs are considered a vulnerable species by the International Fund for Animal Welfare.

Some species were native to India.

Actor Katrina Kaif attended the event with her husband, actor Vicky Kaushal. Kaif wore a floral dress that appeared to feature the Indian giant squirrel, a colorful animal native to India, according to National Geographic. The creature, which is not endangered, appears to be depicted in blue on Kaif's skirt.

Some kept it simple with florals.

Others leaned into the jungle theme with florals, like Rashmi Thackeray, whose husband, Uddhav Thackeray, is the former Chief Minister of the Indian state of Maharashtra. Rashmi Thackeray wore a yellow and purple sari to the pre-wedding celebration.

Each day of the celebration brings a new theme.

Meta CEO Mark Zuckerberg attended the party with his wife, Priscilla Chan. The two attended the event in coordinated black outfits decked out in sparkling dragonflies and florals.

Guests will embark on each day of the three-day celebration with a new theme and dress with the help of Indian stylists and makeup artists, the AP reported.

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