Ariana Grande appeared as Chanel #2 in the episode “Pilot” of Scream Queens on FOX, wearing a Kate Spade Sequin Tweed A Line Dress ($314.99), the same as Chanel #1’s (played by Emma Roberts), an Ellen Hunter Daphne Band ($165.00), her American Apparel Opaque Over-The-Knee Socks ($13.00) and her Saint Laurent Janis Pumps ($775.00) in White, which she also wears with another outfit in this episode. You can get similar pumps for less from Aldo ($31.56+).
Her other outfits from this episode are already posted, here and here.