'Teen Mom' Amber Portwood discusses past drug abuse

"Teen Mom" Amber Portwood. "Teen Mom" Amber Portwood. Photo Credit: YouTube.com

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Former "Teen Mom" reality-TV star Amber Portwood says she was a substance abuser during her entire run on that MTV show. "This is actually my first time on stage sober, so I'm really nervous," Portwood, 23, tells psychologist-host Dr. Phil McGraw on Friday's edition of "Dr. Phil." "Every time you see me on that show," she added, "I am high." In a clip posted Thursday, Portwood also confirmed that she was sincere in 2011 when she phoned ex-boyfriend Gary Shirley threatening to hang herself.

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