The actress was joined by Glee co-stars on stage at the Teen Choice Awards 2013 in Los Angeles on Sunday evening (11 August), where she paid an emotional tribute to Cory.
Cory - who played Finn in Glee - was found dead in a Vancouver, Canada hotel room last month at the age of 31 following an accidental alcohol and heroin overdose.
Lea picked up the prize for 'Best TV Actress – Comedy' for her role as Rachel Berry in Glee. As she went up to accept her award, her co-stars joined her on stage.
Lea said: "I just wanted to be here today to personally thank all of you and tell everyone out there how much all of your love and support has mean to me over these past difficult few weeks.
"Not that I had any doubts before but you guys are most certainly the greatest fans in the world and I wanted to dedicate this ward to Cory.
Lea continued: "For all of you out there who loved and admired Cory as much as I did, I promise with your love we'll get through this together. He was very special to me and also to the world. We were very lucky to witness his incredible talent, his handsome smile and his beautiful, beautiful heart.
"Whether you knew him personally or as Finn, Cory reached out and became a part of our hearts and that's where he'll remain forever."
Lea then joined her co-stars Jenna Ushkowitz (Tina), Amber Riley (Mercedes) and Kevin McHale (Artie) for a group hug on stage as a tribute to Cory flashed up on the screens behind them.
Watch Lea pay tribute to Cory below:
Pictures from the Teen Choice Awards 2013 below:
Copyright: WENN Nikki Nelson