The 45-year-old star's followers have already reached 59, 625 on the very first day and the number is still increasing.
Filmmaker Karan Johar welcomed Aamir by tweeting: @aamir_khan on twitterverse people!!!
Salman Khan posted: "Aamir on twitter guyz".
Priyanka Chopra wrote, "Welcoming the amazing @aamir_khan !!! Show him some loooove people!!!"
Genelia D'Souza posted: "Please welcome the man, the rockstar and a very special person who is the key reason for me being back with "Jaane Tu...", my favourite @aamir_khan"
Nephew Imran Khan also welcomed his maternal uncle by writing: "@aamir_khan = REAL"
Actress Minissha Lamba wrote: "@aamir_khan dear aamir... welcome... u have long been missed on twitter."
Veteran actor Shammi Kapoor also tweeted: @aamir_khan if its you and I hope it is, then a hearty welcome. Love
Jewellery designer Farah Khan Ali also welcomed Aamir by posting: "So excited that Aamir Khan @aamir_khan is on twitter... he is an actor par excellence... welcome him to our tweet world tweeps..."