Not everyone thinks that KHLOE KARDASHIAN and LAMAR ODOM are getting hitched this Sunday for all the right reasons.

–R&B minx MYA . . . (–Who’s currently a contestant on “Dancing With the Stars”) . . . was overheard at some event saying that the engagement is FAKE, and the wedding is, quote, “a publicity stunt.”

–Mya believes that Khloe is only doing this because she’s tired of her two sisters getting all the attention.

–Meanwhile, a so-called “source” tells “People” magazine that this IS kind of a publicity stunt, and obviously, it’s being filmed for the latest Kardashian E! reality show. But that doesn’t mean Khloe and Lamar aren’t in love.

–The source says, quote, “Khloe and Lamar are sure about everything, so they all figured, ‘Why not [rush into it]?!’ It’s a quickie wedding to everyone else, but Khloe knows what she wants.

–”They knew this was it, and they’re just having fun with this whirlwind.”