Cory Monteith

Twitter has announced the top tweets of 2013 -- and the No. 1 most popular posting was also one of the saddest.

Lea Michele appeared on today's (Dec. 12) 'Ellen DeGeneres Show' to perform new single 'Cannonball,' but she also revealed how she has been handling her grief over the late Cory Monteith.

Lea Michele is still reeling from the death of her boyfriend and co-star Cory Monteith last July.

'Glee' will bring plenty of eyes to FOX this Thursday as the musical dramedy drops its season 5 Beatles theme to pay tribute to the death of actor Cory Monteith in "The Quarterback." Last week we caught our first look at the new episode that begins a brief hiatus for the series, while FOX has released both the full track list and songs from the somber hour.

Cory Monteith's death shook the 'Glee' cast and crew to their core. The tribute episode to the star, who died of a lethal mixture of heroin and alcohol, will air this week. Titled 'The Quarterback,' it was the absolute hardest episode anyone on cast or crew has ever had to shoot.

Having aired its two-part Beatles tribute, 'Glee' season 5 will next tackle the difficult subject of addressing Cory Monteith's tragic death in next week's "Farewell to Finn" tribute, "The Quarterback." The first footage of the somber new episode has emerged, along with new comments from series creator Ryan Murphy on filming of the difficult episode.

'Glee' star Cory Monteith died in July at the age of 31, due to a drug overdose. The final coroner's report has been released, revealing that the star, who had checked into rehab in the spring to deal with his issues, was shooting heroin and drinking champagne in a Canadian hotel room on the night of his death. It turned out to be a fatal cocktail.

Jane Lynch delivered an incredibly moving tribute to her fallen 'Glee' costar Cory Monteith at the 2013 Emmys.

Though Dianna Agron wasn't invited to Cory Monteith's tribute episode, she still holds her onetime 'Glee' costar close to her heart. The starlet, who likely won't be returning to the show at all, appeared on 'Katie' to promote her new movie, 'The Family' and wax poetic about her fallen friend.

After weeks of skirting promos and press releases, 'Glee' season 5 has opened up for a full trailer of its forthcoming September 26 premiere "Love, Love, Love," chock full of Beatles tribute numbers, and little else. The gang is all smiles and songs in the first real run of footage from season 5, but how long until the bottom drops out?