Viall memorably reached out to Bristowe after Season 19 Bachelor Chris Soules dumped her on TV and they hit it off to the point where Viall actually went on The Bachelorette to compete for her heart. Despite the fact Bristowe and Viall slept together mid-season, Viall finished as her runner-up behind Shawn Booth.
According to a source, Viall -- who also finished in second place on Andi Dorfman's season of The Bachelorette -- began "hitting up the runner-up" from Higgins' season once he discovered she was single, In Touch Weeklyreported.
Viall and the devastated woman whom Higgins rejected at Season 20's final Rose Ceremony "started seeing each other a couple weeks ago," the source told In Touch. "They live in different states so they've been meeting up in LA."
While many fans love and support Viall, 35, he's a pretty polarizing character because other women accuse him of being a sketchy womanizer.
"Ben probably won't be surprised when he finds out," the source added. "It's typical Nick behavior."