Although "No Doubt" front woman Gwen Stefani divorced her ex-husband Gavin Rossdale on the grounds of "irreconcilable difference," reports fire up today saying that Stefani, in fact, pulled the plug in their 13-year marriage because of Rossdale's cheating.

Multiple reports allegedly say that the "Bush" front man has been having an affair with their family nanny, Mindy Man, for three years. Yet, it was only back in February that Stefani confronted her ex-husband's alleged cheating, right before the 2015 Grammy Awards, as reported by Us Weekly.

According to the publication's source, the 46-year-old singer discovered her ex's adultery through their family iPad, as Rossdale and Mann exchanged explicit texts that exposed their plans of having sex. Stefani also found out that there were exchanges of lewd photos.

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

Immediately after learning his infidelity, Mann was fired. To Rossdale's defense, he reportedly said that their conversations were mere "flirtations." Hence, Stefani gave Rossdale quite another chance because of their kids even though she "knew the truth in her heart" that the affair was more than what Rossdale would claim.

Eventually, Rossdale could not stomach his infidelity anymore that he admitted it to Stefani. Rossdale's confession reportedly "completely devastated" the "Hollaback Girl" singer and she was "mortified, livid, and embarrassed."

At that point, "The Voice" judge wanted to end their marriage, and it subsequently led to their divorce in August.

In 2012, Rossdale and Mann were also reported to have been quite comfortable with each other even though the kids were around. According to Hollywood Life, Rossdale has been photographed inappropriately placing his hand on the nanny's butt as he hikes with her and his sons, Kingston and Zuma. Stefani was not seen in the family hike then.

The cheating reports fired up a day after Stefani talked about her new single "Used To Love You." As previously reported by Latin Post, Stefani referred to her new song as her "breakup record" since she wrote it just after her split with Rossdale.

"My truth is 'Used to Love You': That's the song. That's what I said, and I feel really fine about sharing that, and I feel honored to share it," Stefani told 93.3's "Frankie and Geena Morning Show."

"It's like the two people I...I only had two boyfriends. I wrote two records about them. You know what I mean? It's just weird," Stefani continued. "It just makes me believe in God and my journey. My cross to bear was to go through these heartbreaks and write these songs and help people."