Kevin Federline will get through his divorce with Britney Spears and come out of it stronger, his ex, Shar Jackson, tells PEOPLE.

"He's a trouper," says Jackson, who has two children, Kori, 4, and Kaleb, 2, with Federline. "He knows that everything in life is, ya know, an experience and you learn from it and then you get past it. I'm not worried about him."

Jackson said that despite his bad boy image, Federline is a big softie when it comes to his children. "He's an amazing dad," she said Thursday while shopping for goodies at the Boom Boom Room's Baby and Big Kid Style Villa, a pre-Golden Globes swag party. "He's a great dad and if you said his name right now, Kori would go crazy. That's the love of her life."

Asked about their daughter's special bond with her father, Jackson answered: "He was there for her every minute of her life until, you know, we weren't together anymore. He did everything for her so I guess that's why."