Gwen Stefani and Gavin Rossdale'ssplit is reportedly due to infidelity.
According to Us Weekly, an unnamed "family source" claims Gavin had a three-year relationship with the family's longtime nanny, Mindy Mann.
Gwen reportedly discovered the alleged affair in February when according to the mag text messages between Gavin and the nanny appeared on the family's iPad and were found by one of the family's other nannies.
"The iPad was linked to Gavin's phone," the source told the mag. "One of the other nannies discovered the exchange and told Gwen."
The texts allegedly contained explicit messages between the Bush frontman and Mindy.
The mag source claims that when Gwen discovered the texts, the Bush singer insisted it was merely "flirtation", but months later Gavin, 50, allegedly confessed to the affair, prompting the No Doubt singer, 46, to file for divorce in August.
The mag source said Gavin's alleged admission "completely devastated [Gwen]…She was mortified, livid, and embarrassed."
Gwen and Gavin have three sons, Kingston, 9, Zuma, 7, and Apollo, 20 months.
Since the split, Gwen has begun dating fellow "Voice" coach Blake Shelton.
Access has reached out to reps for Gwen, Gavin and Mindy for comment.
