Credit: Frederick M. Brown/Getty Images Photo: Steven Tyler Speaks up at Idol's TCA Panel on January 11, 2011

Steven Tyler had an extremely emotional moment during an American Idol audition, when a contestant brought his disabled fiancee to watch him compete.

Sources connected with the show tell TMZ, the Idol judges were in Milwaukee when 27-year-old Chris Medina walked into the room, accompanied by his disabled fiancee, Juliana Ramos.

We're told Chris told the judges he proposed to Juliana two years ago ... and the couple was making wedding plans when tragedy struck.  Juliana got into a horrible car accident on her way home from work in October, 2009, and was left nearly paralyzed with significant brain damage.

 

Read the full story and see the video at TMZ.com.