No doubt Tom Hanks was the heart and soul of Big.

But Elizabeth Perkins, who played Susan in the 1988 movie, just revealed that the star wasn't originally chosen to step atop that iconic piano as Josh. During a recent appearance on Watch What Happens Live, Perkins told host Andy Cohen that another Oscar winner was originally cast as the film's lead.

"Robert de Niro was actually cast in the role of Josh in the movie Big," she revealed to a shocked Cohen. "Then it fell apart because he had a scheduling conflict and then they went to Tom Hanks. It's like a totally different movie in my brain with Robert de Niro."

Perkins also confirmed she originally auditioned with de Niro prior to the casting swap. "He was more moody," she said, comparing him to Hanks. "It was more of, a little bit of a horror movie, it was Robert de Niro wandering around the streets of New York."