Gavin Rossdale reportedly cheated on Gwen Stefani with their children's nanny

Gavin Rossdale Reportedly Cheated on Gwen Stefani With Family Nanny

A new report claims Gavin Rossdale had a three-year affair with the family's nanny while he was married to Gwen Stefani.

According to Us Weekly, Stefani learned of the alleged affair after discovering texts between the woman and Rossdale on the family iPad. The messages reportedly contained nude photos of the nanny and plans to meet up for sex. The nanny, who looked after the couple's three sons, Kingston, 9, Zuma, 7, and Apollo, 20 months, was fired despite Rossdale claiming that the textual exchange was just "flirtation."

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The long-term affair was said to have gone on even when Stefani was pregnant with the former couple's third child. She gave birth to Apollo on February 28, 2014.

The rocker reportedly confessed to the affair months after being discovered. Stefani announced she was divorcing him in August.

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Gavin Rossdale reportedly cheated on Gwen Stefani with their children's nanny
NEW YORK - MAY 03: Actors Jude Law and Sienna Miller attend the Costume Institute Gala Benefit to celebrate the opening of the 'American Woman: Fashioning a National Identity' exhibition at The Metropolitan Museum of Art on May 3, 2010 in New York City. (Photo by Stephen Lovekin/Getty Images)
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BEVERLY HILLS, CA - DECEMBER 18: Recording artists Gwen Stefani (L) and Gavin Rossdale attend the PEOPLE Magazine Awards at The Beverly Hilton Hotel on December 18, 2014 in Beverly Hills, California. (Photo by Chris Polk/PMA2014/Getty Images for dcp)

An Us source says Stefani was "was mortified, livid, and embarrassed" over her husband's alleged infidelity and it left her "completely devastated."

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"This was done right under Gwen's nose," a source told the magazine.

ET has reached out to the former couple's nanny for comment.

Stefani has since moved on from Rossdale, and is making headlines for her new romance with fellow Voice team leader, Blake Shelton.

WATCH: Blake Shelton Wants Gwen Stefani and Her Sons to Attend the Kids' Choice Awards

While she hasn't said much about her new relationship, the No Doubt front woman has been quite candid about her divorce.

"There's been loads of people that have helped me with this tragedy," Stefani said in an interview with 103.7 KVIL after her divorce was finalized. "There's definitely key people that have pointed me into the right direction. Blake really helped me. Not to change the subject, but it's kinda on the same subject, Pharrell [Williams] was literally like a guardian angel."

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