Viva Glam is one of my favourite things in the beauty industry. It is at the heart of MAC's ethos and is just such a great charity. It is so rare that a company gives 100% of the proceeds to anything like this, and if you haven't looked up what your Viva Glam money goes to, then please check out http://www.macaidsfund.org/ :)
Anyway! MAC are always looking for an influential (and sometimes controversial) public figure to front their campaign. This year, they chose Miley Cyrus. Whatever your opinions about Miley or her music, I think it's a great way to spread the word about the charity. You get a nice lipstick and are helping people living with/affected by HIV, so I'm usually not bothered about who is the face of the lipstick.