Cher Chaz?!

It's only fair, since her mama has had her share of nips and tucks...

Political and social activist Chastity Bono – the only child of entertainers Cher and the late Sonny Bono – began undergoing a sex change shortly after her 40th birthday on March 4.

"Cher is very supportive and has known about Chastity wanting to do this for a very long time," a source tells PEOPLE. "This will be a long process but it's something Chastity has wanted to do for many years."

Bono's spokesman, Howard Bragman, told TMZ, which first reported the story, "Yes, it's true – Chaz, after many years of consideration, has made the courageous decision to honor his true identity.

"He is proud of his decision and grateful for the support and respect that has already been shown by his loved ones. It is Chaz's hope that his choice to transition will open the hearts and minds of the public regarding this issue, just as his 'coming out' did nearly 20 years ago."

He added, "We ask that the media respect Chaz's privacy during this long process as he will not be doing any interviews at this time."

Keep this quiet? Hell to the NAW!

Cher's offspring requests a peen?

Yeah, YOU try and sit on that one!