"So proud of my brother Gerry," she wrote on Twitter. "Thank G. For running next to me today- love you lots."
Anderson, 46, announced her plans to run the five borough-spanning marathon in September. And it was more than a physical challenge: She raised nearly $76,000, according to her fundraising page, for the J/P Haitian Relief Organization, which aims to save lives and bring sustainable programs to the impoverished Caribbean nation devastated by the 2010 earthquake.
And although she opted for workout attire, she told ESPN she had considered dusting off her Baywatch suit for the occasion. "I had friends ask me to [wear it]. They think it would be really funny," she said. "The bad thing was, I did think twice about it!"
Think her new pixie cut helped her run faster?
Click here to see this year's marathon winners.