Gavin Rossdale and Mindy Mann's cheating rumors swiftly stirred online a week after it was confirmed that Gwen Stefani and Blake Shelton are now dating. The Bush frontman reportedly slept with their nanny after his former wife gave birth to their youngest son, Apollo.

Reports claim that the No Doubt frontwoman filed a divorce from her then-husband after finding out in February that he cheated on her with their nanny, Mindy Mann. He reportedly first admitted flirting with the nanny and later confessed to a three-year illicit relationship with her, leading to the unexpected divorce of him and Gwen.  Access Hollywood reports that the "Used To Love" singer was totally "devastated, mortified, livid and embarrassed" after learning of Gavin and Mindy's affair. 

A source told Us Weekly that Gwen learned about thei alleged cheating when another nanny of the family discovered exchanges of text messages between Gavin and Mindy. There were also a series of nude photos of the 20-something nanny that was sent to Gavin.  "The iPad was linked to Gavin's phone," a family source claimed. "One of the other nannies discovered the exchange and told Gwen."

The witness also went on to say that the 50-year-old rock star often requested to see his children while he was on tour, and Gavin and Mindy would do something on his tour bus when the kids were already asleep.  The incident reportedly happened when the mother of three is taping for the ABC show "The Voice," Daily Mail reports.

Gavin and Mindy's affair has been reportedly going on for three years. A photo of the two even surfaced online when they went hiking with Kingston and Zuma in November 2012. He was caught holding her behind, but the rocker claimed that he's just protecting her from falling. Since she was employed with the ex-couple, the Australian blonde allegedly started to dress like the songstress.

Gavin and Gwen have three children: Kingston, 9, Zuma, 7, and Apollo, 20 months. The former pair hasn't commented on the cheating scandal;, however, sources close to them believe that Gavin and Mindy affair's is "somewhat true."