Did Rihanna get plastic surgery, breast implants to beef up weight-loss?

With all the focus on celebrity weight-loss, one star is walking a different path. As many boast how many pounds they've shed, Rihanna is bragging up weight gain, and Twitter is singing the praises of the new "Thickanna." Riri and fans were worried about her "anorexic" weight-loss. Recently, the "Umbrella" singer looks curvier in the buttocks, thighs and breasts. With a tummy still just as flat, folks have wondered if she had #plastic surgery such as a boob job or butt lift.   Did Rihanna get plastic surgery, breast implants to beef up weight-loss?