I stalk so many celebs, I know it's hard to keep track. By far, my longest ongoing obsession is not The Jonas Brothers, Bon Jovi, U2 or even Obama.It's John Cusack.Since I was 18, it's all about ThatJohn -- so much so that three full-sized movie posters and a card personally autographed to me hang on our home's walls. No, not in a bonus room. The main rooms.I love him.So, you can imagine my shock -- horror really -- when I was reading Melissa Gilbert's autobiography, Prairie Tale, today. Mixed in with tales of Ma, Pa, and the Prairie? She drops this little nugget."Rob (Lowe)... called ahead to his buddy John Cusack, ... and asked him to show me around while I was there. He did, and we ended up having a little fling, which I kept from Rob. ... Only John and I ever knew about it. He was very sweet -- and funny."Whaaa??? My uber-cool, Chicagoan street-savvy, black Irish Catholic obsession got it on with Half-Pint?I could have handled it bettercoming from Nellie Olsen.