Fashionista by Micol Ostow

Madison feels plenty guilty for sneaking around behind Spencer's back with Spencer's long-time boyfriend, Tyler. But what Spencer doesn't know can't hurt her, right? Too bad nothing at Bradford stays secret for long. . . .

As if you didn't know . . . bradfordprep.com

"Stylish socialites Madison, Spencer, and Regan are back in this fashion-packed sequel to GoldenGirl."—School Library Journal