Sahil popped the question to the 32-year-old model in New York City and Dia took to Twitter to share the good news with her fans.
"Officially engaged. #NYC," she posted along with a picture of them.
The couple were in New York to attend one of the award shows and even posed together at the event.
Dia and Sahil also have a production house Born Free Entertainment and co-produced 'Love Breakups Zindagi' with actor Zayed Khan.
The duo is all set to release their second production venture 'Bobby Jasoos', which stars Vidya Balan.