New Delhi, June 22 :Bollywood megastar AmitabhBachchan posted the news of daughter-in-law Aishwarya Rai's pregnancy on Twitter and within half-an-hour had received 2,843 congratulatory tweets from his fans, well-wishers and friends, including the Bollywood brigade."Overwhelmed with your wishes and blessings .. 2843 new tweets in half an hour! Thank you all ! Your affection and love is so touching