There's about to be a lot revealed about Lady Gaga in a new blockbuster biography about the Bad Romance singer that hits shelves on Tuesday, September 14 - and only RadarOnline.com has exclusive excerpts before the book's release.

EXCLUSIVE PHOTOS: Lady Gaga Before She Was Famous

Among the many interesting things about Gaga in Poker Face: The Rise and Rise of Lady Gaga is why she canceled her headlining tour with Kanye West last summer.

"He's a grade-A disaster, a mess. If his name is on it, no one will touch it," a source inside West's camp told author Maureen Callahan.

Lady Gaga’s former tour manager David Ciemny claims she was hospitalized six times in 2009. He alleges that the singer goes to dangerous lengths to fit into her eye-catching stage costumes.

PHOTOS: Lady Gaga Goes Vegas

“When I say she was sick, I mean physically and mentally,” David said in the new blockbuster book Poker Face: The Rise and Rise of Lady Gaga.

David recalled being on tour with Gaga and said she would binge on sweets and unhealthy food, then not eat for weeks to fit into her costumes – one time losing 20 pounds between fittings.

PHOTOS: Craziest Onstage Costumes – Hot Or Not?

Further describing bizarre behavior, David’s wife Angela said that Gaga would cuddle up next to her in bed before her performances and beg for her to come back once she left.

“I would say, ‘Gaga, I have a husband to go home to. I’ll be in the room next door,’” Angela said in the book.

PHOTOS: Lady Gaga Heads To The Tracy Anderson Gym

“She’d call and text me, ‘I miss you, Ange, can you come back?’ So I would,” Angela continued.

“We literally would do our make-up together every morning and get ready for bed together at night.”

PHOTOS: Lady Gaga Blows Kisses To Fans

The 24-year-old Bad Romance singer has admitted to being insecure in the past and said, “When I wake up in the morning, I feel just like any other insecure 24-year-old girl.

“Then I say, ‘B**ch, you’re Lady Gaga, you get up and walk the walk today.”

PHOTOS: Lady Gaga Takes In A Baseball Game In Her Bra

RadarOnline.com was unable to reach Gaga’s rep for comment.