julia roberts

Julia Roberts has launched an all-out attack on the woman whose husband she stole.

And her latest thrust against boyfriend Danny Moder's estranged wife Vera is a T-shirt she's wearing in public that's emblazoned with three words: "A Low Vera."

The shirt -- shown in exclusive ENQUIRER photos -- appears to be a play on "aloe vera," but sources say the handmade lettering is a vicious shot at Vera.

The issue that goes on sale Friday reveals why Julia is furious at Vera, how the "Pretty Woman" is waging war against the makeup artist ... and more.