Here's Why Gwen, Gavin Really Split

What was really behind Gwen Stefani and Gavin Rossdale's divorce? According to Us Weekly's sources, Rossdale cheated on Stefani (and no, not with Courtney Love). Sources say the Bush frontman had a three-year affair with Mindy Mann, his family's longtime nanny. In February, Stefani found (after being tipped off by another family nanny) explicit texts and nude pictures Rossdale and Mann had exchanged, sources say. Mann got fired, but it wasn't until months later that Rossdale admitted to anything other than "flirting" with her, and at that point Stefani decided to split.

The affair "was done right under Gwen’s nose," a source says, including while Stefani was pregnant with the couple's third child, Apollo, who is now 20 months old. On Monday, Stefani may have made a reference to the nanny affair, Us points out: She did an interview on KIIS FM during which she said her "life blew up last February." She called the whole thing "unexpected. I was going along thinking that was going to be the rest of my life and it's not. I don't know what happened." That's when she started writing "Used to Love You," she explained. (See what Stefani recently had to say about her new guy.)