News broke that the former Miss World and her husband Abhishek Bachchan are expecting a child when the couple were congratulated by his father Amitabh in a tweet.
Tandon tweeted from her own account: "I remember, she and me together on flights, going for concerts, chatting, long hrs (sic) away, then too she dreamed of a happy settled family life."
She added that Rai Bachchan is "a strong [Scorpio] lady" and has "moulded" her life as she wants.
Tandon recently returned to cinema, starring opposite Amitabh in Bbuddah Hoga Tera Baap.
He recently complemented the 36-year old actress on her first Bollywood role in five years, describing her as having the same "gusto" as earlier in her career.
It was recently reported that Rai Bachchan will continue shooting on Madhur Bhandarkar's Heroine throughout her pregnancy.
