Tony Mancil, who had been dating the high-profile attorney for about a year, asked her to wear a blindfold on a date Saturday, and drove her to a digital billboard on Interstate 30 displaying a photograph of the couple and the message, "I love you Mimi. Will you marry me?" the Fort Worth (Texas) Star-Telegram reported Tuesday.
With a growing business and four children from a previous marriage, Coffey's priority wasn't a wedding, she later said, but asked Mancil for time to think about his digital proposal.
He then got down on one knee and officially asked her to marry him.
The billboard message now reads "She said yes! Mimi you have made me the luckiest man ever!" the newspaper said.