Yeah, Paris Hilton is definitely using Studio Fix.
Rachel Bilson- Dr. Pepper Lipsmackers lip stuff
SATC girls- LM Tinted Moisturizer
Mally Roncal uses chapstick as lip bases, neutrogena build-a-tan, and Voluminous on her clients.
Ken Paves uses light blonde L'oreal Fiera on Jessica.
Jessica Alba uses Revlon colorstay concealer
Nars Casino bronzer on J. Lo
Beyonce, Infalliable L'oreal foundation, L'oreal Blush Delice, L'oreal eyeshadow, Mally Beauty eyelash curler, Mally Beauty eyeliner, L'oreal squeeze tube lipgloss (not sure what it's called) Mally's smoky eye kit... all I know from mallybeauty.com