Paulina Rubio’s Ex Husband — She’s CRAZY!

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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.

Vallejo-Najera is now pulling out all the stops.  He claims she hasn”t undergone a psych exam as ordered by the judge, so he now wants hizzoner to make it clear — she better get her head shrunk, or else.

BTW … Vallejo-Najera says he handed the tyke over to the “X Factor” judge on August 3, and hasn”t seen the kid since.

Crazy, huh