Kareena's father Randhir and elder sister Karisma were the first to step out onto the balcony.
The wedding will be followed by receptions in Mumbai and Delhi and a ceremony at Saif's ancestral Pataudi Palace in Haryana.
Bollywood superstar Shah Rukh Khan was among the first actors to congratulate the couple, tweeting “Happiest marriage bond to my friend Saif and Kareena.
May Allah keep your family healthy and happy.
Just saw it is registered, sealed and delivered.”