Paulina Rubio's Ex Husband -- She's Crazy

09/29/2013 11:37 am ET

Paulina Rubio needs to have her head examined because she's frickin' crazy ... so claims her ex- husband who is trying to get a judge to order a psych evaluation on her.

We broke the stories ... Paulina and Nicolás Vallejo-Nájera have been battling for more than a year over their son.  It's ultra-bitter, with each accusing the other of alienating the boy from them.

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