The party was held on the terrace of Kareena's residence in suburban Bandra last night.
Several close family members and celebrities including Babita, Neetu Singh, Soha Ali Khan, Kunal Khemu, Sanjay Kapoor, Tusshar Kapoor, fashion designer Manish Malhotra, Malaika Arora Khan and Kareena's good friend Amrita Arora attended the party.
"It was just a fun party with close family and friends. It was meant to be only for 50 to 60 people. It was not a 'sangeet' ceremony," Manish Malhotra told PTI.
Kareena was dressed in an orange lehenga, teamed up with a heavy necklace, green bangles and flowers in hair, while Saif was seen in a white outfit.
On the occasion Tusshar Kapoor said, "I wish them all the happiness and a successful married life."
The couple will have a registered marriage tomorrow which will be a quiet affair.
It will be followed by a reception in New Delhi on October 18.