PETA is really letting the fur fly over Lady Gaga's wardrobe.

People for the Ethical Treatment of Animals senior vice president Dan Mathews penned a scathing open letter [3] to the "Poker Face" singer Monday, accusing the chanteuse of backing down from her anti-fur stance by sporting animal pelts in recent photos.

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"Many of your gay fans, I among them, have long admired what you told Ellen: 'I hate fur and I don't wear fur,' Mathews' letter begins, referring to talk show host Ellen DeGeneres. "[But] these recent photos of you in fox and rabbit and with a wolf carcass make it appear that you have amnesia."

Mathews goes on to ask Gaga if she's done an about-face on the subject of animal fur and suggests that the singer just might be targeted by the group when it cranks up its new awareness campaigns this fall.

Also read: Lady Gaga Taking Vow of Silence After Oprah Interview [5]

"What happened? Are your stylists telling you that it's fake, or are you a turncoat?" Mathews wonders. "Many gays are animal advocates because we recognize that the same arrogance and indifference that some have toward animal suffering has at times been directed toward us personally because of our orientation. PETA has long participated in Pride events around the country, and just last week, we helped lead protests against Chick-fil-A. But by wearing those dumb furs in a heat wave, you're making yourself a target just like the mindless Kim Kardashian.

"As we plan our fall campaigns, please tell us whether what you gracefully told Ellen was heartfelt or just a pose," Mathews concludes.

Odd, one would think, that after Gaga sported an outfit made of animal flesh [6] at the MTV Video Music Awards a couple of years ago, there would be precious little left for PETA to complain about.

A spokeswoman for the singer has not yet responded to TheWrap's request for comment.