Jennifer Hudson showed off her slimmed-down figure at The Grove to promote her first book, "I Got This: How I Changed My Ways and Lost What Weighed Me Down."

The talented singer's book follows her 80-pound weight loss journey, and includes how being overweight influenced her mindset. After struggling with weight issues and industry pressure to be thin, it was ultimately her 2-year-old son, David, who made her want to get in better shape. Hudson says she and fiance David Otunga "wanted to start him off right."

The "American Idol" alum says it was important for her to share her story with fans to help inspire other people to be healthy and chase their dreams.

Being a spokeswoman for Weight Watchers contributed largely to her new physique, "because it's not a diet. It's a lifestyle."

Check out "Extra's" interview and Hudson's new book, in bookstores now!

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