While co-hosting the Today show with Willie Geist, Shields, 48, revealed how bitterly her marriage to Agassi ended during a segment titled "Dealing With Divorce: How to Move On", reported Us magazine.
"I am divorced. And mine was very quick and relatively easy but it's a very interesting thing because he -- quote, unquote -- did say to me, 'Be happy that we don't have children or I would not have made this easy for you.'
The former child model married the professional tennis player in April 1997 and they divorced just before their two-year wedding anniversary.
Shields later remarried in 2001 to television writer Chris Henchy. They have two daughter together, Rowan, 10, and Grier, 7.