Haag popped the question, and the duo tied the knot in 2011.
The actress recalled the special moment, and said: "Yes, it's true that Peter proposed to me while I was shooting for 'Will You Marry Me' and it was the best surprise. I may do a lot of films but this experience will always be special and close to my heart even though I have done a special appearance in the film."
"Will You Marry Me?" is about a beach wedding, and it has been shot at many locations, including Dubai, Mumbai and Bangkok. It is directed by Aditya Dutt.
Celina is now happily married and based in Dubai, but shuttles down between there and Mumbai for work.