The artists from the UK are heading to help at London's Positive East and Edinburgh's Waverley Care to overhaul the visiting centres for the charities.
In addition, 100% of the sales price of Mac's Vivia Glam Lipsticks and Lipglasses goes directly to the Mac AIDS Fund, benefiting grantees in more than 30 countries.
Visit the World AIDs Day website here to find out how you can get involved. Have you been raising money for the cause? Leave a comment and let us know what you've been up to!