Frost, 44, who is a fashion designer, had divorced Law, 36, in 2003, and she has three children with him, Rafferty, 13, Iris, nine, and seven-year-old Rudy.
Law recently became a dad again, fathering a baby girl with American model Samantha Burke following a fling earlier this year, and internet gossips suggested the news had infuriated Frost because of the implications for her own young children. But Frost is adamant she will always stand by her ex - no matter what.
“We're continuing to have a very close relationship and I'm here to support him as a friend. That won't stop. He's a wonderful person and I'll stand by him forever," the Daily Express quoted her as telling Britain's Grazia magazine.
“For all the silliness and difficulties, we've always really cared for each other and we're both a hundred per cent committed to the kids and doing the right thing by them. Everything's fine," she added.