With all the work that Heidi Montag has had done on herself, it’s really hard to tell if she’s saying this with a straight face, but the Hills villainess swears that her decision to give herself a whole new face under the surgeon’s scalpel last fall is the wisest move she’s ever made. Okay, so perhaps “wise move” may be a relative term where Montag is concerned, but she still swore up and down on her Twitter account on Monday that it is so: “My last surgery was the best decision of my life! Anything anyone else says (family members who are…