Kapoor, 32, and Khan, 42 -- Bollywood's answer to Brad Pitt and Angelina Jolie -- held an official ceremony at the groom's home in the city, to be followed by an evening party at the grand Taj Mahal Palace hotel.
The newly-weds emerged to pose and wave to the large press pack waiting outside the residence. Kapoor appeared in a red bridal wear, while Khan wore a simple grey kurta.
The couple have been dating for five years and come from famous acting families, with their wedding attracting frenzied media coverage.
"Party time" ran the headline in the Mail Today, which offered breathless coverage of a pre-wedding function in Mumbai on Sunday evening.
"Dressed every inch like a bride-to-be, Kareena dazzled in an orange-yellow lehenga (skirt) and a shimmering golden choli (top)," it said.
"Beau Saif Ali Khan turned out more on the simpler side. He looked dapper in a white outfit."