"London bound! So excited about promoting 'Barfi!' The film and my single comes the same time, and such different vibes to both! Very grateful," tweeted the 30-year-old.
In 'Barfi!', releasing Sep 14, the National Award-winning actress plays an autistic girl.
At the same time, the actress is making her debut as a singer with "In my city", featuring Will.i.am. It will be launched Sep 13 as part of 'Thursday Night Kickoff', a pre-game show for Thursday Night Football.
However, the release of the full song and accompanying video for "In my city" are expected later this year.