(Charley Gallay/Getty Images)

When Wisconsin TV anchor Jennifer Livingston was bullied by a viewer who called her overweight, people across the country rallied around her. Her famous brother, actor Ron Livingston, is also speaking up for his younger sister.

"My sister Jennifer … brings an exceptional dedication to her job, her family, and her community, and has been a role model of mine for many, many years," Ron Livingston, 45, said in a statement to People magazine.

The "Office Space" star added that he is "extremely proud" of his sister.

"I got a text from him first thing this morning saying, 'Way to go sissy. I'm so proud of you,'" Jennifer Livingston told "Good Morning America" Thursday.

Livingston, 37, addressed the man who sent her a letter chiding her for being overweight. In an on-air editorial Tuesday morning that lasted more than four minutes, she also acknowledged being overweight - even obese - then added, "To the person who wrote me that letter, do you think I don't know that?"

VIDEO: Man Who Sent News Anchor 'Bully' Email Not Apologizing

Livingston's bold statements made headlines around the world and she told " Good Morning America" Wednesday why she decided to speak out.

"This was a personal attack," Livingston said. "Calling me obese is one thing. Calling me a bad role model for our community that I've worked at for 15 years and especially for young girls when I have three girls was a low blow and I thought it was uncalled for and I wanted to call him out on it."