Now, we've got a look at the steamy chemistry between the two characters.
The two actors filmed a passionate make-out scene near a petrol station today, which is obviously the enchanting location of all your rom-com dreams...
We're already keen to see how this romance pans out on-screen when the film debuts in 2018.
A Star Is Born will be a first for both stars, as Cooper will be making his directorial debut, while Gaga makes her silver screen debut.
Of her first role on film, Gaga said:
"I am so excited to star in my first movie alongside someone I'm so lucky to call my friend. I always wanted to be an actress on the big screen. The story of A Star Is Born is so special and I'm so grateful to Bradley for making my dream come true. Can't wait for you to meet Ally."