Bollywood star Kajol gave birth to a baby boy Monday morning, seven years after her daughter Nysa was born.

Kajol and Ajay Devgn got married in 1999.

Kajol, who recently featured as a doting mother in Karan Johar's "We Are Family", gave birth to the child at 9.20 a.m at Mumbai's Lilavati Hospital, a source close to the couple told.

Bollywood celebrities like Shah Rukh Khan and Priyanka Chopra Monday sent congratulatory messages to Kajol and Ajay Devgn through micro-blogging site Twitter on the birth of their son.

Shah Rukh, who is one of Kajol's closest friends in the film industry, posted: "Bringing life on earth is the most beautiful gift of god. Allah bless Ajay and Kajol with happiness and health. Son of a Devgn! Wow."

Kajol gave birth to the baby boy at 9:20 a.m. at Mumbai's Lilavati Hospital. The couple tied the knot in 1999 and has a seven-year-old daughter named Nysa.

Riteish Deshmukh, who has shared screen space with Ajay in "Cash" and "Masti", was among the first actors to announce the news on Twitter.

"Congratulations Ajay and Kajol...a baby boy arrives, " he posted.

Following his post, several celebrities began posting their good wishes for the couple and the new born.

"It's amazing when a new life comes into the world. Congrats Ajay and Kajol on the birth of your baby boy, " posted Priyanka Chopra. Divya Dutta too posted the same.

Fashion designer Manish Malhotra, who has worked on the actress' wardrobe for many films, including "Kabhie Khushi Kabhi Gham", said: "My dearest friend kajol is blessed with a baby boy today".

National award winning filmmaker Madhur Bhandarkar too sent in his wishes, and so did Mallika Sherawat, Bipasha Basu and Arshad Warsi.

"God bless the little rock star that has come into the lives of Ajay and Kajol, love the Devgn family, " posted Arshad.