Comedian Joan River isn't apologizing for jokingly calling First Lady Michelle Obama a transgender woman.

Rivers, 81, reportedly made the joke last week after performing an impromptu wedding ceremony for a gay couple in New York City.

(Related: Joan Rivers performs surprise wedding for gay couple.)

In a brief on-the-street exchange with an unidentified reporter, Rivers said she was “excited” about the wedding.

“And I think I should do very well because I don't charge,” she quipped.

“And do you think that the United States will see the first gay president or the first woman president?”

“We already have it with Obama, so let's just calm down,” she joked. “You know Michelle is a tranny.”

“I'm sorry, she's a what?” the reporter asked.

“A transgender,” Rivers answered. “We all know. It's okay.”

In a statement given to CNN, Rivers explained her remarks, which have generated headlines.

“I think it's a compliment. She's so attractive, tall, with a beautiful body, great face, does great makeup. Take a look and go back to La Cage Au Follies (sic). The most gorgeous women are transgender,” she said.

“Stop it already ... and if you want to talk about 'politically correct,' I think this is a 'politically incorrect' attack on me because I'm old, Jewish, a woman and a 'hetty' – a heterosexual ... and I plan to sue the reporter who, when he turned off his camera, tried to touch me inappropriately on the a** – luckily he hit my ankle. Read the book ... if you think that's silly, wait to (sic) you see what I say about FDR and Eleanor!” she added, a reference to her latest book, Diary of a Mad Diva.