Frost, referring to Miller's taking Tuesday night off from her performance in the London production of As You Like It in order to sort things out with Law, spoke to reporters who caught up with her at a party in central London that she attended with new boyfriend Jackson Scott, Britain's Sky News reports.
Law's seven-month engagement to Sienna is up in the air after he admitted an affair in March with Daisy Wright, the nanny of his three children with Frost – who reportedly hired Wright to look after the kids in New Orleans, where Law was shooting All the King's Men.
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Frost, 38, whose divorce from Law was finalized in June, claimed to be as shocked as anyone when she read about her ex's affair. "I didn't see this one coming – it was a total shock to everyone," she said, adding about Miller: "This is not my crisis, thank God. ... I will talk to her if she calls me. I'll have to consider what I say."
Knowing Law, does the news come as a surprise? "Yes, actually it does," she told PEOPLE.
Wright, meanwhile, appears to know just what to say. Revealing all to London's Mirror, the 26-year-old, consulting her diary, describes Law, 32, as "a masterful lover who made my whole body tingle." The result, she said, "was mind-blowing rampant sex ... amazing, wonderful."
The initial seduction, she says, took place over a bottle of wine. "The next thing I knew, he was kissing me. ... We kissed and kissed for what seemed like ages. ... The next thing I know, we are dragging each other upstairs to his bedroom, kissing and then, in the bedroom, ripping off each other's clothes."
The bliss was eventually interrupted at dawn, when Law's son walked in on the pair in bed, saying, "Daddy, I'm having a bad dream."
According to Wright, "Jude said, 'It's all right, darling, go back to bed.' The next thing I know, Jude was kissing my neck and all over. ... It was fantastic, he was just great. It was just what I needed."
When the child later informed his mother about what daddy was doing, Frost fired Wright, the Mirror reported.