Joan Rivers has proved once again that no topic is off-limits when it comes to promoting her latest book.

The comic, 81, appeared on HuffPost Life this week and after making jokes about Rosa Parks and Anne Frank, she made jokes about Chaz Bono, the transgender son of Cher and the late Sonny Bono.

Rivers spoke with host Marc Lamont Hill when she held up a Ken doll (of the Barbie line) and pointed out that the doll does not have male genitalia.

‘Ken I think, unfortunately … I found out to be Chaz Bono,’ Rivers said as Hill dissolved into laughter.

Said Hill: ‘You’re saying Ken has a vagina?’

Rivers: ‘Ken is good looking but nothing at home.’

The comic also said of Bono: ‘I don’t know what’s connected and I hope for his sake it is. It must be very hard, you’re father’s not too bright – you know, skied into a tree and there was no snow.’

Bono’s father was a US Congressman when she was killed in 1998 in a skiing accident.

Rivers’ jokes come at a time when famous trans personalities as Laverne Cox and Janet Mock have worked to raise public awareness about moving beyond body parts when talking about trans people.

In case anyone takes offense, Rivers also said: ‘You know, we’re all celebrities and just be lucky people know who you’re talking about. You don’t make jokes about people no one knows.’

Bono, 45, began his transition in 2008 and in 2010, he legally changed his gender and name. He shared his story by writing a book called Becoming Chaz and being the focus of a documentary of the same name.