Heidi Montag hires PI to investigate Spencer Pratt's affair?

spencer-pratt-heidi-montag-book-how-to-be-famous-gi-500.jpgMore drama in Speidi-ville!

Former "Hills" stars Heidi Montag and Spencer Pratt are now accusing each other of having extramarital affairs. 

Which is a great way to fuel the faux separation rumors and build buzz for Heidi's proposed summer reality show, because so far no network has snatched it up. And if this total lack of interest continues, they may have to call the "show" what it really is: Heidi and Spencer's summer vacation video.