Gwen Stefani's Ex Husband Gavin Rossdale Alleged Affair

Gavin Rossdale, now ex-husband of The Voice star Gwen Stefani, had cheated with their nanny, which prompted Stefani to file for divorce this summer, Us Weekly says.

The affair was said to have lasted three years, even through Stefani's third pregnancy with their youngest son, Apollo.

"If Gwen would eat something or do a workout or get a new handbag, Mindy would do the same thing", a source told Us.

The No Doubt singer was reportedly tipped off that unsavory texts between Rossdale and Mann - purported to include naked photos of the nanny and plans to meet up for sex - could be found on their family iPad.

Gwen Stefani and Blake Shelton have at least one person rooting for them - Christina Aguilera. When the Bush rocker reportedly confessed to the affair several months later, Gwen made the painful decision to call it quits.

Gavin Rossdale out with sons Kingston and Zuma and their nanny Mindy Mann

Since splitting from Gavin Rossdale, Gwen Stefani has begun dating fellow "The Voice" coach, Blake Shelton.

Their shock split in August came after 13 years of seemingly wedded bliss. According to a close source to Stefani, she went to the doctor in October and is doing everything she can to prepare for a new baby.

As reports of an alleged affair with his family's nanny dominate the headlines, Thursday was just another day for Gavin Rossdale. The former couple share three sons together, 9-year-old Kingston, 7-year-old Zuma and 20-month-old Apollo.

On Tuesday, while chatting on San Diego radio station 93.3, Stefani said that she herself is not aware of being in a new romantic relationship.

Reps for Rossdale and Stefani have yet to comment on the report. "It completely devastated her," a source told Us.