Rihanna is a blonde bombshell in her new ad for MAC Viva Glam lipstick. The Bajan beauty rocks platinum blonde bob and bold, red lipstick in a topless pose for the luxury makeup line.

"#MACgirlz my new #VIVAGLAM lipstick AD CAMPAIGN is out now! Every penny you spend on my #VIVAGLAM lipstick goes to the @maccosmetics MAC AIDS Fund to support people directly affected by HIV/AIDS! To find out more go to MACcosmetics.com #StayTuned," she tweeted about her new, sultry ad.

RiRi landed her partnership with MAC early last year. "When you think of makeup, the brand that pops into your mind -- for something legit -- is MAC,” the singer told WWD. “Whatever color you want, it’s like ‘Let’s go to MAC.’ I’ve been using MAC on tour for such a long time it was a natural fit for me. I have always loved makeup, and I always said that if I do it, I want to do it with a credible brand.”

Elsewhere in fashion, Rihanna is causing waves with her sexy, $900 Swarovski bikini. She Finds shares that the pricey swimwear was a free gift from Swarovski. The songstress wore the warm weather item while romping around the beautiful beaches of her native Barbados.