We love Gwen Stefani, but we especially love how calm and classy she's been in the wake of the news that soon-to-be ex-hubby Gavin Rossdale cheated on her with their family's longtime nanny.

On Friday the singer stepped out in Los Angeles, and she kept her outfit casual, but as always, her hair and makeup were flawless. And that smile? We have a feeling new beau Blake Shelton has something to do with that!

Last week the news broke that Gavin was cheating with family nanny Mindy Mann for years before Gwen Stefani uncovered their affair. Us Weekly reports that the No Doubt singer discovered naughty texts between Gavin and the nanny on a shared iPad after being alerted by another staff member. "One of the other nannies discovered the exchange and told Gwen," a source told the mag. When confronted, the father-of-three initially tried to brush off the infidelity as "flirtation" but ended up confessing shortly after. "[The confession] completely devastated her. She was mortified, livid, and embarrassed," the source added.

We have a feeling Gavin is the one who should be mortified, livid, and embarrassed. Who cheats on GWEN?!