If you're mean to Justin Bieber, Selena Gomez thinks you're a big old meanie.

Unless you're, you know, actually Selena Gomez herself, in which case it's totally fine.

Days after bailing on an interview when the talking head on hand asked about Bieber's bad behavior, Gomez appeared on 'Good Morning America' this morning (July 26) and chatted about the Canadian singer.

"He and I have had such a history together," Gomez said. "I'll always care about him and protect him if anyone tries to be mean."

Except if that anyone is David Letterman, in which case Gomez will go along for the ride. Oh, and unless she's making a dance video. Then it's totally acceptable to be mean to Bieber.