Gwen Stefani's marriage to Bush rocker Gavin Rossdale reportedly ended because she found out he was cheating on her.

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According to multiple insiders, The Voice coach decided to call it quits with Rossdale after 13 years of marriage because she discovered he had been unfaithful with their children's nanny, Us Weekly reported.

Rossdale, 50, allegedly had a three-year affair with the family's longtime nanny, Mindy Mann, a cute young blonde. Mann cared for the couple's three sons -- Kingston, 9, Zuma, 7, and Apollo, 20 months.

Rossdale "completely devastated" Stefani, a source told Us. "She was mortified, livid, and embarrassed."

Mann and Rossdale's sexual encounters were allegedly "done right under Gwen's nose," even when she was pregnant with Apollo.

Stefani, 46, reportedly first caught wind of Rossdale and Mann's affair back in February when she came across some explicit text messages on the family's iPad between her husband and Mann. The texts included nude photos of the nanny as well as specific plans to meet up for sex. 

"The iPad was linked to Gavin's phone," a family insider told the magazine. "One of the other nannies discovered the exchange and told Gwen."

Stefani fired Mann shortly afterwards despite the fact Rossdale claimed there was only "flirtation" happening between them, according to another source. But Rossdale confessed to adultery months later, when the "Used to Love You" singer determined they needed to split.

The pair later announced their shocking decision to get a divorce in August.

Stefani is currently dating her The Voice co-star Blake Shelton although it's clear she doesn't want to rush things and isn't into labels. The No Doubt songstress confirmed she does not consider herself "in a relationship" yet.

Rossdale's representative declined comment on the allegations against him, and Stefani's representative couldn't be reached.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.