For years many people have wondered: How is Janet Jackson, 41, thin one day and not so thin the next? Now the wait is over. “I’m writing a book on my journey of weight loss and weight gain,” says Jackson, who dropped 60 lbs. last year.

In the still-untitled tome, she plans to share what she did “nutrition-wise to get down in size when I needed to.” Is the singer, who’s been dating music producer Jermaine Dupri for five years, slimming down to fit into a wedding dress?

“I don’t necessarily need the paper to validate the love that I have,” says Jackson. “I’ve done it twice. The next time – if I do it – I really don’t plan on divorcing.” Plus, she adds, “I pray this doesn’t bite me in the butt, but the third time is a charm.” [source: People]