Amber Portwood has admitted that she was almost always high while she was filming MTV reality series 'Teen Mom'.
The 23-year-old mother told in an episode of Dr. Phil that she was really nervous while filming the episode, as it was the first time that she was sober on the stage, Us magazine reported.
Portwood served 17 months of her five-year sentence in prison, and was released in November 2013.
