Avril Lavigne. People forget just how successful she's been. Goodbye Lullaby underperformed (still selling about 1.5m) mostly because of it's non-mainstream sound, bad promotion and little record label or radio support but now the Kweens on a good record label and your faves wigs will get snatched faster than they can suck Dr Lukes dick for another hit.
Avril | Nirvana | Taylor | J.Law
Vampire Weekend | Gwen | The Smith's | Jack White
Rihanna | Blink 182 | All Time Low | The Pretty Reckless
It's a little weird to call it a "comeback" when all she's having is a little hiatus after her debut album before she releases the second real full lenght LP. She has so much more in store as an artist than she has shown so far, all her unreleased material and a few other gems confirm that imo.