Arnold's Baby Mama MANEATER!

5/23/2011 4:30 AM PDT

Arnold Schwarzenegger's Housekeeper's Family -- She Got Around

No one in Mildred Patricia Baena's family was surprised when they found out she was the mother of Arnold Schwarzenegger's love child ... because, well, she liked the fellas. 

Sources very close to Baena tell TMZ ... she was extremely aggressive when it came to chasing men -- like a heat-seeking missile.  They say her flirting was often "inappropriate," but her tactics frequently worked -- at least short-term.

Our sources says Baena almost always made the first move -- going after whomever she wanted -- and Arnold was no different. 

We're told when news of Arnold's affair with a household staff member broke, but before the baby mama was named, Baena's friends and family knew it was her.