A slim and healthy Jennifer Hudson stepped on to the stage to celebrate 10 years of O, The Oprah Magazine at the Live Your Best Walk in New York.
Oprah called Hudson up to the stage to perform and praised the new mum about her new "skinny-fied" physique.
The Oscar winning actress is the newest celebrity spokesperson for Weight Watchers and has trimmed down after the birth of her first son, David Daniel Otunga, Jr. in August 2009.
"I decided to try Weight Watchers because I wanted to make healthy changes, and I needed a plan that would fit in with my busy life," says Hudson on the Weight Watcher's US site.
"I'm learning so much about healthy living, and I’m proud of how far I've come."
Watch the video above to see Jennifer's hot new shape.
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