Diaz, 42, dissuaded the 33-year-old television personality from filing for divorce from the musician, who are contemplating a divorce after nearly five years of marriage, reported Life & Style magazine.
"Cam has persuaded Nicole to stop her divorce proceedings for now. Ever since Cam got married, Nicole's been turning to her for advice," a source said.
The "Knight and Day" star, who is married to Joel's brother Benji Madden, is also getting support from her husband, who wants the pair to make each other their priority.
Nicole has seven-year-old daughter Harlow and five-year-old son Sparrow with Joel.
