Nov 23 2010 Most people call the day after Thanksgiving Black Friday, but this year, the day has a whole different color. To celebrate Nicki Minaj's debut album, Pink Friday, MAC collaborated with the singer on a limited-edition lipstick of the same name. Nicki, who designed the creamy pink shade ($14.50) herself, launched the lipstick at MAC's Times Square store today. If you love it, here's the catch: the lipstick will be available only online, and only for the following four Fridays. After that, it's history. So if you're feeling this shade, mark your calendar for Nov. 26. As far as that crazy-cool hair color goes, though, you're on your own.