The Jessica Sierra interview begins at the 14:00 mark

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Former American Idol finalist Jessica Sierra (left) admitted to being drunk while performing on the fourth season of the hit reality show.

Her downward spiral began when her mother died during the audition process, she tells Dr. Blogstein’s Radio Happy Hour.

“I couldn’t function for a day without being drunk.” Sierra said about her time on AI, “The drinking part, I think I could hide that pretty well, but I was a mean person.  I was really mean to everybody.  I just didn’t care.”

“I think I was particularly mean with Carrie Underwood (right).  Our personalities just didn’t click. She was such a happy person all the time and I was so miserable and I had to take it out on someone.”

Sierra, who later appeared on Celebrity Rehab with Dr. Drew, was never able to get in contact with Underwood to make amends, the ninth step in the Alcohol Anonymous 12-Step Recovery program, so she used the radio show to reach out.

“I am sorry for being such a bitch.” she wants Underwood to know, “It wasn’t anything that she did other than being happy all the time. “