OSLO, NORWAY - JULY 25: Rihanna  performs on stage at Telenor Arena during The Diamonds World Tour 2013. in Oslo, Norway. (Ph
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Rihanna announced last February that she had inked a deal to become the new face of MAC cosmetics, and now the Barbadian beauty has revealed her latest campaign for the company—and it's a hot one.

The "The Monster" singer, always the generous soul, took to Instagram and Twitter to share the smoldering poster for her Viva Glam line and express her excitement.

Along with the poster, featuring a bewigged and bare RiRi wearing only smoky eye-makeup and the reddest of sexy red lips, she tweeted:

Nice, but we couldn't help but notice that her Instagram level of excitement was markedly higher (and more explanatory) than her Twitter level. RiRi said the following via Instagram:

"#MACgirlz my new #VIVAGLAM lipstick AD CAMPAIGN is out now! Every penny you spend on my #VIVAGLAMlipstick goes to the @maccosmetics MAC AIDS Fund to support people directly affected by HIV/AIDS! To find out more go to MACcosmetics.com #StayTuned (shot by: @inezvinoodh)"

Honestly, it's high time Rihanna Twitter followers rise up and revolt against their favorite popstar's preferential treatment of Rihanna Instagram fans. 

Or they could just joint Instagram as well. But that's not as fun.

Either way, we're guessing fans on both sides of the social media sphere will want to get their hands on this sultry collection.

We certainly do. Just be sure to use those little disposable brushes when you are trying on the new looks in your local MAC store!! 

The last time Rihanna's lipstick made the news it was for a decidedly less glamorous reason.