The girl, named Mindy Mann, had apparently been conversating sexting with the Bush frontman and said messages ended up on the family iPad thanks to Apple's notorious iCloud.
Mann was in charge of caring for the couples three children: Kingston, 9, Zuma, 7, and Apollo, 20 months.
Source: Us Weekly
Rather shockingly, Us claims to know that Mindy and Gavin's extramarital activities had been going on for a period of three years, including the time frame Gwen would've been pregnant with little Apollo.
And although this discovery happened almost nine months ago, after another of the family's nannies ratted Mann out when she saw the iPad, Gavin didn't admit to it being true until August.
The admission “completely devastated [Gwen],” a source tells Us. “She was mortified, livid, and embarrassed.”
That, of course, brings us up to date with their divorce announcement over the summer and the No Doubt singer's recent relationship revelation with her Voice costar, Blake Shelton.