A list of celebrity used nail polishes, who uses them and where possible a link to where you can find them. Shades they have said they use or were spotted wearing are in brackets -

Bourjois Very Vernais Nail Polish

Used by - Demi Moore (Beige Paris)

Essie Nail Polish

Used by - Katie Holmes (Sugar Daddy), Rihanna (Wicked)

Hard Candy

Used by - Drew Barrymore

NARS Nail Polish

Used by - Isabeli Fontana (Jungle Red)

OPI Nail Lacquer

Used by - Madonna (Italian Love Affair), Teri Hatcher, Reese Witherspoon (I'm Not Really A Waitress), Ashlee Simpson (OPI Black Onyx), Miley Cyrus

Click on underlined products for more info