The Best (and Worst) Grey's Anatomy Guest Stars of All-Time

The Best (and Worst) Grey's Anatomy Visitor Stars of All-Time
Grade: C Demi Lovato is a singer/songwriter and an, ahem, &quotactress&quot best known to the Disney demographic. On Grey's, she performed a youthful girl whose freak-outs ended up attributed to schizophrenia but were in the future identified to be a consequence of a hole in her …