The 31-year-old star shared a poster of the 2007 film on social media and asked her fans to celebrate the moment with her.
The film was also actor Ranbir Kapoor's debut film. He was recently seen in Karan Johar's Ae Dil Hai Mushkil.
Saawariya did not do well at the box office but Sonam has earned critical acclaim for films like Raanjhanaa, Khoobsurat and Neerja.
Sonam's next film is Veere Di Wedding, produced by her sister Rhea Kapoor and directed by Shashanka Ghosh. The film also stars Kareena Kapoor Khan and Swara Bhaskar.
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