Karl Engemann, father of Larry King's wife Shawn and ex-manager of Marie Osmond, has found himself in the middle of a bidding war over who will publish a possible tell-all book about the famous singer, a source tells X17online.

Engemann managed Osmond for 35 years, but in November of 2009, the singer fired him. The 80-year-old entertainment manager has since filed a defamation lawsuit against Osmond.

As for the tell-all book, an industry insider tells X17online exclusively:

"Many don't realize that Marie and Donny don't get along, and off camera, the two have knock-down-drag-out fights. And these fights aren't your typical brother-sister arguments. She fights with Donny about who sings more songs, who says more lines, who has more words, everything. Marie is petty and wants to take credit for things she doesn't do. This book would reveal it all."

Marie and her brother Donny are currently performing a nightly show at the Flamingo Las Vegas.

The performer had plans to walk down the aisle again ... but those plans have changed. Find out what happened ... after the jump.

Courtesy: Harpo

Osmond, 51, recalls her son talking about depression. She says:

"When I heard him say to me, I have no friends, it brought back when I went through depression because you really feel so alone. I'm not a depressed person, but I understand that place, that darkness. I told him... Mike, I'm gonna be there Monday and it's gonna be okay.'"

As for whether she has any regret, Osmond tells Oprah:

"I think there's always 'what if's. 'What if I had just put him on a plane and said come be with me, or gone there? I think if you live in 'what if's,' you stop living."

After being criticized for returning to the stage just one month after her son's death, Marie says it was a "calculated decision" because she "knew that if I didn't get back on stage that I may never get back on stage." She added that the "stage is my safe place."

Marie Osmond's interview with Oprah airs today.

Photo courtesy: Flamingo Hotel & Casino

Marie Osmond is back to work on The Donny & Marie Show at the Flamingo Hotel in Las Vegas, but she will be keeping a lower profile given recent tragic events. A source at the Flamingo Hotel & Casino tells X17online exclusively:

"Marie is not doing any meet and greets with fans after the show. Until further notice, only Donny will be available to fans for pictures and to sign autographs."

This past weekend, the Osmonds held the funeral for Marie's son Michael Bryan who jumped to his death from his Los Angeles apartment building two weeks ago.

Marie's fans weren't sure that she'd be able to return to the Vegas stage so quickly. Our Flamingo source tells us that after four of the dates were canceled for The Donny and Marie Show, the Flamingo box office was flooded with calls from ticket holders inquiring whether the show would be canceled for the entire month.

But last night, those in attendance at The Flamingo Showroom witnessed the singer getting emotional onstage when talking about her son. Our source tells us exclusively, "If you can wait to see the show, it would be best because she's pretty emotional right now."

We're also told that ticket sales for The Donny and Marie Show have picked up since the tragedy. Last night's show was completely sold out, and as for tonight's performance, only a handful of tickets remain.

Marie Osmond's son Michael Blosil committed suicide by jumping to his death around 9pm on Friday evening. Marie's brother Donny tells Entertainment Tonight, "Please pray for my sister and her family."

Michael reportedly left a note, and he has struggled with depression over the years. Back in 2007, Michael, then 16, was admitted to a rehabilitation facility.

We're just crazy in love with Marie Osmond! Or is that in love with crazy Marie Osmond?

Here's the singer slash Dancing With the Stars fainter launching a new line of dolls at the Flamingo in Sin City over the weekend... hey, you know Marie just <3's her dolls!