And both actors easily had hearts racing as they made their separate arrivals down the red carpet on Sunday night.
Starting with Leo, he was dapper as usual in a classic midnight blue and black tux...
Which left all eyes on the Steve Jobs actress, who looked breathtaking in a modern black gown with a thigh-high slit, all accented by stunning diamonds, a beautiful rose clutch, and sparkling pumps.
Doesn't she look GORG??
Plus on the red carpet, Kate even spoke about her OTHER costar, Michael Fassbender, saying:
"I actually felt as though I had to look after him a little because he was so immersed and focused on the role that I would sort of watch him getting thinner and thinner. It was sort of a stress thing with him."