julia roberts

Julia Roberts is frolicking with a handsome new boyfriend -- a married man she stole from his devastated wife.

The "Runaway Bride" star is steaming up TinselTown and New Mexico with Brad Pitt look-alike Danny Moder, a 32-year-old cameraman.

Meanwhile, his brokenhearted wife Vera has fled home to her family.

You can read all the sizzling details of the shocking affair -- including their romp at Julia's ranch -- in The ENQUIRER that goes on sale Friday.