PIN-thin stylist Rachel Zoe was “flipping out over the phone and screaming at the top of her lungs” at the Weinstein Co./Valentino pre-Oscar party at the Andaz Hotel in LA, our spy reports. Maybe she was just stressed out. “Her television career is interfering with her styling work. Clients are getting very upset,” a Hollywood insider said over the weekend. Zoe, who styles Jennifer Garner, Joy Bryant and other celebs, traipsed through the H. Stern and Natura Bisse suite at the Beverly Hills Thompson Hotel, where a pal let slip that Debra Messing dropped her as her stylist. A different spy said Cameron Diaz was also irked that Zoe wants to be a star in her own right and is letting her attention slip.