John Branca is all smiles over the “Michael” biopic — especially when it comes to Miles Teller playing … well, him.

We caught Branca in L.A. Monday and he couldn’t stop hyping Miles — calling him a great actor and basically gushing over his performance in the film, which Branca also produced.

Check the clip … he also shows love to Jaafar Jackson, who steps into the King of Pop’s shoes for the role.

What’s wild … you’d never guess Branca’s in the middle of a messy feud with Paris Jackson, who’s been blasting him and co-executor John McClain over money issues tied to MJ’s estate.

Paris also took aim at the biopic itself … questioning why Branca cast an A-lister like Miles to play him, calling it a pricey move that might not pay off at the box office.