They were spotted bowling with friends at Latitude 30 in Jacksonville, Florida, on October 30, and a source has confirmed they are seeing each other, reported Us magazine.
"They were grabbing kisses and holding hands. He put his arm around her a few times," the source said.
According to the source, Tebow "was a true gentleman, helping her on the stairs when they went to the arcade area."
"They were having a great time together," the source added.
Prior to her relationship with the athlete, Belle dated singer Joe Jonas from 2008 to 2009. Tebow has been falsely linked to Taylor Swift and Dianna Agron in the past.