James Tupper plays Dr. Andrew Perkins. You may remember him from Men in Trees.
The internet movie database does not list a character named Aaron on Grey's Anatomy. Aaron Refvem is the actor who plays Jackson Prescott.
Kevin McKidd
T.R. Knight, the actor who plays George O'Malley on the ABC series Grey's Anatomy is gay.
Actor Jeffrey Dean Morgan.
Brent Spiner
the doctor is lexie and the one that has the baby is molly
Chyler Leigh plays Lexie Grey on Grey's Anatomy.
Chandra Wilson plays Meranda Bailey in Grey's Anatomy.
The actor who plays Kurt Hummel on GLEE is Chris Colfer the actor.
Mary McDonnell plays Dr. Virginia Dixon on Grey's Anatomy. On the show she portrays a heart surgeon with Asperger Syndrome. She also played the First Lady in Independence Day and President Laura Roslin on Battlestar Galactica.
The actor that plays Seth in Superbad is Jonah Hill.
The actor who plays Max is Jake Wood