LMBO!!! Posted Aug 15th 2007 2:34PM by TMZ Staff "The Hills" attention-whore-in-chief Heidi Montag got a serious rock from her, uh, beloved fiancee, Spencer Pratt. But it looks like the bling is about as "real" as all the *****fighty drama on the MTV series. As you may have seen, not-so-big-spender Pratt asks to borrow pal Brody Jenner's credit card to buy the engagement ring -- slow week with no tabloid photos to sell! Princess Heidi's engagement ring was purchased from the Ice Accessory store at a mall in Brentwood. Spencer ultimately picked out what looked like a pink diamond surrounded by diamonds, and even crowed that J. Lo and Kobe's wife Vanessa had identical ice, and that Heidi would need "a GPS device" for the ring in case she lost it. One problem: Heidi's ring is a big fat FAKE! Sources tell TMZ that the pink diamond is really a lavender, lemon amethyst! The ring is surrounded by diamonds and the ring retails for $2,890! Not exactly chump change, but definitely a little low-rent for Jenny's block -- or ring finger.