Champion tweeted on Friday that he has "never been happier" to share a bit of personal news.
"We are thrilled and so excited and thank everyone for their good wishes," he said.
According to ABC, Champion and Robierb met through mutual friends in Miami. Robierb is a photographer who shows his work in Miami, Santa Monica, New York and Atlanta.
The two plan to wed later this year.
Champion joined ABC News in 2006. Before that, he spent 18 years at New York City television station WABC.
The Associated Press contributed to this report.