MARIETTA, Ga. -- One of the so-called "Barbie Bandits" said Thursday that stealing money from a bank was "a bad idea."

Ashley Miller testified Thursday in Marietta in the trial of a man accused of organizing the bank heist. She called it the "worst decision I ever made."

Miller also testified that she and the defendant, Michael Darrell Chastang, were romantically involved.

Authorities said Chastang was behind the February 2007 heist and put Miller and Heather Johnston in touch with the bank teller.

Miller and Johnston made headlines after they were videotaped wearing sunglasses and laughing as they appeared to steal nearly $11,000 from a Bank of America in Acworth. But authorities said what at first looked like a bank robbery turned out to be a theft involving a complicit teller. The girls were arrested days later.

Authorities said the four split the money.

Johnston, Miller and the bank teller, Benny Herman Allen III, pleaded guilty to theft charges in the case and testified against Chastang.