The supermodel's spokeswoman, Debi Zornes, says the celebration of Doronin's 50th birthday kicked off in the 15th century Mehrangarh Fort in the city of Jodhpur on Tuesday night. The festivities included fireworks, traditional music and dancing and an elaborate buffet meal.
Another party is slated for Wednesday evening at another medieval palace, Umaid Bhawan, which is now run as a hotel.
All 42 rooms at the palace hotel have been booked for Campbell's guests.
No other details were immediately available.