Cox, 32, is also the subject of a new documentary, Right-Footed, and at the premiere on Friday, Cox met 3-year-old Ruth Evelyn "RE" Pranke, who was also born without arms. In the above video, Cox autographs a poster for the girl, grasping the pen with her foot but writing with immaculate penmanship, "You can do anything."
In an interview with ABC News, Pranke's mother, Karlyn Pranke, said she wanted to bring her daughter to meet Cox in order to show her that being born without arms doesn't need to hold her back in life.
"I wanted her to see she doesn't have to have arms," she said. "I wanted her to see all the things Jessica can do."
When Pranke learned that her child would be born without arms, she researched online and started learning about Cox and her many accomplishments.
"Ever since, it's been very inspirational to me that [Cox] has come as far as she has to overcome her disability – and my daughter has always said, especially lately, 'I want arms, I want arms.' "
Pranke's plan seems to have worked. She told ABC News that RE left feeling feeling very impressed by Cox. "She's been saying since we got home, 'She's just like me. She doesn't have arms,' " Pranke said.
From Charity Hospital to Charitable President: One Man's Inspiring Story
The two were also photographed embracing, proving that you don't need arms to share a hug.
In a Facebook post on Tuesday, Cox referred to the touching moment, saying "Meeting my mentor had the same effect on me."