40-year-old Kareena, the daughter of Bollywood actors Randhir Kapoor and Babita, was admitted to Breach Candy Hospital, a leading private hospital in Mumbai, on Saturday night and gave birth to the baby boy on Sunday morning.
"Yes, Kareena gave birth to a baby boy today morning. We are overjoyed. Both the mother and baby are doing well," Kareena's father Randhir told the media.
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The couple -- dubbed Saifeena by the paparazzi -- announced the pregnancy on social media in August last year. "We are very pleased to announce that we are expecting an addition to our family!! Thank you to all our well-wishers for all their love and support."
Kareena and Saif tied the knot in 2012. They welcomed their first son, Taimur, in December 2016. Saif also has two children -- actor Sara Ali Khan and Ibrahim Ali Khan with former wife Amrita Singh, also a Bollywood actress.
Born to the Kapoor family, known as the 'First Family of Bollywood', Kareena -- the granddaughter of legendary actor-director Raj Kapoor, made her acting debut opposite another legendary actor Amitabh Bachchan's son Abhishek with the 2000 drama Refugee.
Her real success came in 2004 when she played a sex worker in the drama Chameli. She subsequently earned critical recognition for her role in the 2006 crime flick Omkara, a character based on William Shakespeare's heroine Desdemona.
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Recipient of several awards, Kareena is one of Bollywood's highest-paid actresses. She will be next seen in Advait Chandan's Laal Singh Chaddha and Karan Johar's Takht. Kareena is also all set to publish her first pregnancy book later this year.
Saif, on the other hand, is the son of former Indian cricket captain Mansur Ali Khan Pataudi and former Bollywood's yesteryear heroine Sharmila Tagore.