'X Factor' Judge Paulina Rubio Sues Telemundo -- Donde Esta My Money, Bitch?

"X Factor" judge Paulina Rubio doesn't take kindly to being snubbed ... in fact, she's now suing Telemundo for trying to replace her on the upcoming season of a kids-themed singing show.

Paulina -- who appeared as a coach on season 1 of Telemundo's "La Voz Kids" last year -- claims the network agreed to pay her $1.325 million to appear on the second season as well ... then reneged on the deal when it found someone cheaper to replace her with.

Paulina claims Telemundo offered up a weak excuse for the diss ... citing scheduling issues with Paulina's commitment to "X Factor" ... but she's not buying it.

Paulina wants Telemundo to cough up the $1.325 million stat ... plus another $100,000 for season 1 "La Voz Kids" clips featuring Paulina which the network sold for ad purposes.