updated 03/29/2012 AT 2:00 PM ET
•originally published 04/04/2012 AT 6:45 PM ET
Fifteen years ago, the youthful star-crossed lovers in 1997’s Titanic – played by Leonardo DiCaprio and Kate Winslet – helped propel James Cameron’s epic blockbuster into box-office history. The film earned $1.8 billion worldwide and scored 11 Oscars.
Now Titanic is sailing back into theaters on April 4, this time in 3D. To mark the re-release, which is taking place along with the 100th anniversary of the real sea disaster, PEOPLE spoke with Winslet and Cameron about their memories of the film – including a few surprises: