February 10, 2011 at 10:23 PM EST

Image Credit: George Burns/Harpo StudiosOscar-winner Jennifer Hudson appeared on The Oprah Winfrey Show today, showing off her newly svelte body and addressing her mother, brother, and nephew’s tragic murders in 2008. The actress got emotional when discussing the crimes with Winfrey for the first time. Said Hudson, “The only thing I can do to honor their memory is to make them proud.” Hudson said that her family and God have helped her get through the more trying moments.

But the hour wasn’t completely somber: Hudson also talked about her amazing weight loss with the help of Weight Watchers.  “It’s like a brand new me,” she said. Hudson told Oprah and her audience that she lost a whopping 80lbs and revealed that, at a size 6, she was at her goal weight. “That 4 and that 2 and that 0 is not for me,” exclaimed the actress.

Project Runway‘s Tim Gunn also appeared and gave makeovers to some of Hudson’s family members who also signed up for Weight Watchers and dropped the pounds. Hudson then took the stage to debut her new song, “Where You At,” off her new album I Remember Me, out March 22. Thankfully, the drastic weight-loss has taken none of her vocal power away.

Read more:

Jennifer Hudson and Terrence Howard are Mr. and Mrs. Mandela in ‘Winnie’: Check out the trailer

Jennifer Hudson breaks long silence, discusses family’s murder on Vh1’s ‘Behind the Music’: ‘It was surreal’

Jennifer Hudson welcomes baby boy

Jennifer Hudson opens up about her late mother

Jennifer Hudson on ‘Oprah’ (Feb. 2009): ‘I pray every morning’

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