The singer-turned-actress couldn't wait to giver her co-star a smooch for the cameras. Looks like he didn't mind it, either!
They also got playful on the red carpet. Earlier this week at the Los Angeles premiere, the 43 year old actor told People magazine he "made a friend for life" with his on-screen leading lady.
Gaga looked regal and star-like in this white and gold stunner.
The 32-year-old also wore her best accessory...that smile! The fashionista added a pop of color to her outfit with that pink sparkler on her finger.
As for the 43-year-old who acted, directed and co-produced the movie, he posed for selfies, making this night one to remember for fans.
What do you think about Lady Gaga and Bradley Cooper's project? Is it Oscar worthy? Let us know in the comments below: