Jennifer Hudson has lost 80 lbs. – and that may not be the end of it.

"I do like where I am," the Oscar- and Grammy-winning singer-actress, 29, tells Extra. "I like seeing a difference each and every week, so we'll have to wait and see."

Her fiancé David Ortunga is also keeping a close eye on her slimming figure. "He's getting adjusted to it," she said Saturday at Andre Agassi’s Foundation for Education event in Las Vegas. "I'll say that, pleasantly adjusted."

Hudson, who shed the weight in 12 months thanks to Weight Watchers and an intense workout regime with celeb trainer Harley Pasternak, is a mother to 1-year-old David Jr., but would love to have more kids the future.

"One more baby," she says. "I want a girl so bad, but give me another three to four years."