Courtney Robertson reportedly has bigger public image concerns than how she has come across on The Bachelor this season.

The Bachelor bachelorette filmed a sex tape with former boyfriend Cavan Clark and is worried Clark -- whom she allegedly dumped to go on the ABC reality dating show -- may release it publicly, Us Weekly reported in its February 20 issue.

"It's pretty dirty," an insider told Us. "There are photos too.  But it isn't Cavan's style to release them."

However, Robertson, a 28-year-old model from Santa Monica, CA, is reportedly still concerned that Clark, a photographer, may go public with the materials or unflattering details about her.

"She's worried about her ex exposing secrets about her," another source told Us about Robertson, whom The Bachelor's broadcast have shown engaging in seductive and aggressive behavior to catch Bachelor Ben Flajnik's attention and promote jealousy amongst her fellow bachelorette competitors.

According to Us, Robertson began dating Clark in February 2011, and he quickly became entranced in her spell.

"He was planning to propose to her with a 3-carat Tiffany ring that she picked out," a Robertson source told Us, adding however, that the model had a sudden change of heart and dumped Clark over the phone.

"She told Cavan she needed time to be single. She told him she needed three months alone."

Robertson supposedly knew she had been cast on The Bachelor at the time and figured she'd let Cavan find out for himself months later.

"Cavan turned on the TV and she was on The Bachelor," the insider told Us.