Jennifer Lopez knows a thing or three about media harassment and being in the public eye 24/7, but that only makes the far-fetched romantic comedy Marry Me seem even less tolerable or redeemable than it might have looked on paper. In its opening minutes, this slickly made, music-drenched concoction serves up a premise so massively implausible — that one of the hottest female singers on the planet would replace her cheating macho fiancé in front of a live TV audience with an ineffectual single dad math teacher in his 50s — that it can never recover. It is, in two words, perfectly preposterous.