"I never made a comment about Gisele or Tom publicly," Moynahan, who graces the March cover of More, tells the magazine.
"I have a relationship with these people on a daily basis. I'm raising a child, and it's public. The media creates these dramas, and that's not what's happening in my life."
And, she adds, that the blended family is going well. "My son has two loving parents and an extended family, whether it's cousins or stepmothers or boyfriends. My son is surrounded by love."
Still, Moynahan, who turns 40 in April, admits being a single mom has been tough, starting with the birth itself in August 2007.
"[Tom] was not in the [delivery] room," says Moynahan, who had already split from Brady when she discovered she was pregnant at two months along after experiencing irregular periods. "He was there on that day and came in afterwards. He certainly wasn't holding my hand while I pushed."
Relying on her parents and friends for support, she recalls "hyperventilating" with anxiety after giving birth: "Every time my dad mentioned he had to go [home to Massachusetts], I'd start crying."
Even though she doesn't believe "any girl grows up dreaming of being a single mom," she also stresses, "There's not a second I regret having a child on my own."
A New LoveApart from her son, another positive force in her life is her new boyfriend, Charlie's Angels director Joseph "McG" McGinty Nichol.
Revealing they met on an airplane, Moynahan – who currently plays an almost-divorced prosecutor on the CBS series Blue Bloods alongside Tom Selleck – says McG is not only good for her, but for her son, as well.
"He's witty, he's smart, he's incredibly funny, he's got incredible taste, and he comes from a great family," Moynahan gushes. "He's the salt of the earth but also very successful in the crazy business that we're in."
And, she adds, "He and Jack have a great relationship."