"'Heroine' will have the cash registers ringing this weekend!!! Congratulations in advance Madhur," Johar wrote on Twitter.
"Bebo is phenomenal in 'Heroine'!!! She owns, projects and understands the complexities of the protagonist to perfection," he added.
"Heroine" features Kareena as Mahi Arora, an actress, and the movie narrates the ups and downs in Mahi's life and career. The actress has earlier said it is her bravest role ever, and no wonder, expectations from the film are high.