"We're very happy and we're enjoying each other's company," Grammer, 43, tells Andy Cohen on the Real Housewives raucous reunion show, which aired Monday.
Charalambopoulos, who is eight years younger than Grammer, is "sweet," according to her costar Lisa Vanderpump.
"He's quiet and reserved," Kyle Richards added. "It's very cute the way he stares at Camille."
According to Grammer, her new guy gets along with her kids, too. "They like him a lot," she says. "He spends a lot time with them. He adores enjoys them and they adore him."
When asked if she and Charalambopoulos are getting serious, Grammer says, "I'm only seeing him. I'm devoted to him that way. I believe in monogamy."
As for her custody battle with Kelsey Grammer, she says it's "ongoing" but she and her ex, who's expecting twins with his new wife Kayte Walsh, don't communicate.
"He won't speak to me," Camille says. "I've reached out. I think we need to communicate to co-parent our children. It is a shame because I've tried."