Rihanna was criticized by the animal rights organization after she took to the streets of London on Thursday wearing a pair of thigh-high snakeskin boots, according to the Daily Express.
"Rihanna may not have a clue that snakes killed for boots are often nailed to a tree and skinned alive. Of course, they can't go on Oprah to cry about it," said a PETA spokesperson, referring to the singer's recent appearance on Oprah Winfrey's talk show.
"Wearing reptile skin is creepy and callous, and it makes her look even more out of touch. She and Lady Gaga seem so desperate to be freaks instead of recognized for their talents that you have to wonder if they realize that they are being laughed at."
Lady Gaga had previously been praised by PETA for her anti-fur stance.
However, the animal rights group lambasted Gaga for being a hypocrite last month after she was seen donning a number of fur coats in public.
"These recent photos of you in fox and rabbit and with a wolf carcass make it appear that you have amnesia. What happened? Are your stylists telling you that it's fake, or are you a turncoat?" wrote Dan Matthews, PETA's senior vice president, in a letter published on the group's website.
The "Born This Way" singer has yet to confirm whether or not her fur coats were real, but has defiantly responded to the accusations with a cheeky tweet.
Lady Gaga and Rihanna are not the first celebrities to have incited PETA's wrath.
Jessica Simpson, Reese Witherspoon and Kim Kardashian have all been criticized in the past for what the nonprofit has deemed ethically irresponsible fashion choices. Kardashian, for instance, was given PETA's "Celebrity Grinch Award" last year for her love of fur.