She tweeted, "Just returned from the glorious Napa Valley - the gourmand's and wine-lovers' paradise- with a DELICIOUS announcement. Stay tuned...
"'Delicious update': ENGAGED to the love of my life. Jason Dehni proposed in Napa. #happiestdayever (sic)," she added.
The model-turned-actress also posted a picture of herself with her fiance. Lisa, born to a Bengali father and a Polish mother, made her debut in Bollywood in 2001 with Vikram Bhatt's "Kasoor".
She is best known for her performance in Deepa Mehta's Oscar-nominated film, 'Water', The 39-year-old has successfully battled cancer after being diagnosed with multiple myeloma in 2009. She announced she was cancer-free in 2010 after a stem cell transplant.