As reported by AOL Music, after losing 80 pounds on Weight Watchers, Jennifer Hudson has never felt better. But the former 'American Idol' does admit to some strange side effects from losing those excess pounds -- like her own son not recognizing her!

In a new interview with Good Housekeeping, Hudson opens up about the unusual situation. "He's never known me overweight," Jennifer says of her son David. "If he sees a clip of the old Jennifer from 'Dreamgirls,' he doesn't know who it is!"

Despite the fact that little David is confused by Jennifer's former fuller figure, he was actually the person who inspired Hudson to keep the weight off! "Everything changed the day my son was born," she says. "Motherhood brought tremendous responsibilities -- none greater than the obligation I felt to get healthy and be there for my son."

"David deserved to have a mama who could run after him without getting wounded or tired, to have a role model who could teach him to make healthy food choices," continues Hudson. "I needed him to grow up with a mama who always would be there for him by caring enough about herself to take control of her health and her eating."

Jennifer is so committed to her healthy lifestyle, that the singer is writing a weight loss memoir -- due out this year. While the inspirational book will undoubtedly help many of her fans, Jennifer's pound-shedding ways have also effected those close to her. "Over 75 of them are on Weight Watchers, and they've lost over 2,000 pounds altogether," Hudson says of her large family. "My cousin beat me -- she's lost 112 pounds!"

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