It's been over ten years since the Oscar-winning pair worked together on the 1997 blockbuster.
In the new flick, directed by Kate's husband, American Beauty director Sam Mendes, Kate and Leonardo portray a suburban couple in the Fifties who quit Connecticut for a new life in France.
British actress Kate says the whole experience of her husband directing her in love scenes with her US co-star was a strange experience. "I just kept saying, 'This is too... weird'. And Leo was like, 'Oh, get over it'. And I'm going, 'Yeah, a little reminder: You're my best friend. He's my husband. This is a bit weird'."
Revolutionary Road, which contains some steamy love scenes between the pair, is due to go on general release in Britain in January