Rachel Bilson was just one more hot chick trying to break into the business until she landed the role of the ultimate Valley Girl on the Fox hit The O.C. Now as "Summer Roberts" she's TV's newest and favorite bitch. Success didn't come out of the blue for the big-breasted brunette--though now viewers' blue balls will be coming buckets. No, Rachel was first seen in various guest spots on such sitcoms as 8 Simple Rules for Dating My Teenage Daughter and Buffy the Vampire Slayer. Because she's made her career on the mislabeled boob tube, her boobs have remained stuck in her tube top. But thanks to the success of The O.C., Rachel has made her first pictorial spread for the men's mag Stuff. Looking over the scantily clad pages, Mr. Skin can firmly say, "I like her stuff."