After her sizzling campaign for Armani Jeans and Emporio Armani last fall, pop superstar Rihanna is at it yet again, modeling for the fashion house's Spring/Summer 2012 Emporio Armani Underwear ads.

The sexy Bajan beauty replaced actress Megan Fox as the spokesmodel for the designer last summer, and her first campaign debuted last September.

And speaking of sexy images, the singer recently posted a slew of pics of herself in various swimsuits to her Twitter page. Check out pics here.

She also jus tbecame one of only 11 female acts to spend 10 weeks or more at the top of teh singles charts after her latest single, "We Found Love," hit #1.

She joins the likes of Whitney Houston, Mariah Carey, Olivia Newton John,Missy Elliott, and Beyonce.


More pics from Rihanna's Armani shoot after the video...