Well from wat I've heard it's hitting stores tomorrow and here's the link that says this It seems like Rihanna is unstoppable these days! Between her Diamonds tour, River Island clothing line and rumored romantic ups and downs, the sexy star is certainly playing her cards just right to always stay in the spotlight. And this time, it's her highly anticipated MAC lipstick, RiRi Woo , that's making headlines! NEWS: Nicki Minaj's MAC lipstick is Viva Glam's best-selling ever The cool cosmetic collaboration officially launched today online and apparently sold out almost immediately thereafter. "Red lipstick all on da paper!!! #RiRiWoo #SOLDOUT #3HOURS #lookatyou #nowlookatus," the singer tweeted triumphantly this afternoon. Luckily the megapopular new item hits store shelves tomorrow! Would you buy Rihanna's MAC lipstick? PHOTOS: Check out trends from our spring beauty guide