She wants Rosetta, who has four kids with oil heir Balthazar, to admit their relationship was dead BEFORE he fell for Sienna.
But furious Rosetta, 38, is refusing to play ball after we exposed her 33-year-old actor husband’s affair with movie siren Sienna, 26.
Our source said: “Sienna is being portrayed as a femme fatale and fears for her career because Hollywood hates a home wrecker. She hopes Balthazar can get Rosetta to put out a statement saying their marriage was already over. They have already got friends to speak out, saying he was sleeping on their sofas.”
But our source added: “It’s nonsense that the marriage was already over.
“When Balthazar went away in May, Rosetta thought it was to see his sick mum in Germany. But she now knows that it was to cavort with Sienna in Prague.”
We revealed in June how Factory Girl star Sienna was holed up in LA with Balthazar just days after dumping Welsh actor Rhys Ifans. She was later snapped frolicking topless on a yacht in Italy with Balthazar—who has now left his wife.
Now we can also reveal Sienna and Balthazar were first introduced while Sienna was still with Rhys but rumoured to be romancing his movie pal Matthew Rhys.