Rihanna is back with MAC. This time with her second Viva Glam collection (past faces have included Lady Gaga, Pamela Anderson and Elton John).

She told her fans on Twitter to 'Check out my new @MACcosmetics #VivaGlam ad. All sales go to people affected by HIV/AIDS. Comin @ ya this September!!' alongside a picture of the campaign in which she sports a neon green wig, a hairstyle we're pretty sure only Ri Ri can pull off.

Last year the singer chose a classic red frosted lipstick and matching Lipglass for her Viva Glam offering, but for 2014 she's gone daring with a nineties-inspired two-piece collection. On MAC's US website the new lipstick is described as 'warm mauvey silver frost', while the Lipglass is said to be a 'cool mauve with red frost'.

What do you think of the new shades? Tweet us @ELLEBEAUTYTEAM

Rihanna's MAC Viva Glam collection will be available online on 8 September and in stores 11 September.