Hurrah! Leo DiCarprio has finally won his first Oscar.

After four previous attempts, the Revenant star picked up the gong for Best Actor… while leaving his Titanic co-star, Kate Winslet in tears.

She was one of the first to congratulate him as he took to the stage after his name was called out, and while he gave his speech, Kate was seen with tears rolling down her face.

And while we're all delighted Leo won his award, his speech was something no one expected. He spoke about climate change.

"Making The Revenant was about man's relationship to the natural world…climate change is real,' said Leo.

"It is happening right now. It is the most urgent threat facing our entire species and we need to work collectively together and stop procrastinating.

"Let us not take our planet for granted," he concluded. "I do not take tonight for granted."

Yes, we know it's a bg issue but we didn't expect him to get down to it on the biggest night of his life.

But, sure look, we're over the moon for him.