"Love, laughter and happily ever after to the beautiful bride-to-be," read a post on the official Twitter handle of Roy Kapur Films, which is producing the movie.
Priyanka, Nick, director Shonali Bose, and producer Siddharth Roy Kapur are seen in the accompanying pictures, which also feature a cake with several candles and a bottle of champaign. In one photograph, Kapur is popping the champagne.
The cake reads: "Congratulations to our dear bride-to-be P.C.J."
The couple left Delhi for Mumbai late on Saturday ahead of their nuptials, which are reportedly set to take place between November 29 and December 2 in Jodhpur.
Preparations have been on in full swing, but the wedding dates have not been officially announced yet.