MUMBAI, India - Bollywood is abuzz with the bombshell news of screen darling Aishwarya Rai Bachchan expecting a child, thanks to a gleeful tweet from her megastar father-in-law.

The 37-year-old Loreal spokeswoman and her husband, actor Abhishek Bachchan, have kept mum since the news was announced late Tuesday by 68-year-old Amitabh Bachchan on Twitter.

The elder Bachchan tweeted "And so to becoming a Dada!" -- meaning grandfather -- "The doctors just confirmed it this evening, and I have shared it immediately."

The news triggered a wave of congratulatory tweets from other stars.

There has been speculation in recent weeks after newspapers published photos showing a more full-figured Rai Bachchan, who starred in "Bride and Prejudice" and dozens of Bollywood films.