Demi Lovato is back for an all-new episode of Glee tonight.

In “Trio”, With graduation approaching, Tina (Jenna Ushkowitz) is worried about losing her McKinley family after they all go their separate ways. In order to make the time they all have left together more memorable, she, Blaine (Darren Criss) and Sam (Chord Overstreet) decide they need to say goodbye to their alma mater in dramatic fashion by staging a Senior Lock-In.

But, when Principal Sue (Jane Lynch) abruptly cancels the event, the trio decides to take matters into their own hands, and get more than they bargained for.

Meanwhile, Elliot (Adam Lambert) finds himself in the middle of Rachel (Lea Michele) and Santana’s (Naya Rivera) fight.

“Trio” airs TONIGHT, Tuesday, March 4th @ 8PM ET/PT on Fox. 10+ stills inside from Glee…

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Lea Michele and her co-star Chord Overstreet keep close as they hold candles while filming a memorial scene for Glee on Tuesday (February 25) in Los Angeles.

The 27-year-old actress and 25-year-old actor were joined by their fellow castmates Chris Colfer and Darren Criss.

PHOTOS: Check out the latest pics of Glee

“Blamchel is real!!! Figure it out,” Chord tweeted that day. Blaine + Sam + Rachel?

Later that night, Amber Riley was spotted heading to dinner at Mr. Chow with friends in Beverly Hills.

35+ pics inside of the Glee cast filming a memorial scene on set… More Here! »

Darren Criss and Chris Colfer go for a romantic stroll while shooting on the set of Glee on Tuesday (February 25) in Los Angeles.

The guys seemed to be filming a somber scene and Chris, 23, had visible cuts and bruises all over his face. We hope Kurt is OK!

PHOTOS: Check out the latest pics of Glee

“They’re very, very young and they’re engaged, so they’re going through some troubles, as any young engaged couple would, I imagine,” Chris recently told E! News about the couple’s future.

20+ pics inside of Darren Criss and Chris Colfer on set… More Here! »

The current and former cast of Glee reunites to celebrate 100 episodes in Los Angeles on Monday night (February 24).

Lea Michele, Chris Colfer, Chord Overstreet, Melissa Benoist, Naya Rivera, Kevin McHale, Blake Jenner, Jenna Ushkowitz, Harry Shum, Jr., Jane Lynch, Dianna Agron, Becca Tobin, Alex Newell, Amber Riley, Jacob Artist, Heather Morris, Darren Criss and Mark Salling all grouped together while Matthew Morrison cut the cake.

“Big day at #Glee today celebrating our 100th episode! The whole gang is here! And we’re singing a glee classic :) #glee100thepisode,” Lea tweeted from the bash.

Dianna added, “We had a few last words with our cast & crew, and that was it. The conclusion of the 100th episode. What a journey. pic.twitter.com/8nEpVSDLMU

Amber also shared: “Today was an exhausting yet amazing day. The conclusion of #glee100thepisode. Working with friends is a dream.”

The 100th episode of Glee is slated to air in March. Can’t wait to see it!

10+ pics inside… More Here! »

Rachel (Lea Michele) channels her inner Fanny Brice for her Funny Girl Broadway debut in these news stills from tonight’s episode of Glee!

In “Frenemies,” tensions flare in New York after Santana (Naya Rivera) successfully auditions to be Rachel’s understudy.

Elsewhere, Tina (Jenna Ushkowitz) and Artie (Kevin McHale) both vie for the title of class valedictorian.

Glee returns tonight @ 8PM on Fox. Click inside to see the complete song list for the upcoming 100th episode too!

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Lea Michele channels Rachel Berry in a super cute outfit while filming scenes for her hit show Glee on Wednesday (February 19) in Los Angeles.

The 27-year-old actress was joined on set by her co-star Kevin McHale as they shot a scene together.

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Over the weekend, Lea showed off her amazing bikini bod while lounging in the sun with some gal pals.

“Enjoying a relaxing weekend in sun with my best friends. So happy!” she captioned one of the pics. Check them out below!

30+ pics inside of Lea Michele filming Glee scenes… More Here! »

Lea Michele and Dianna Agron go red-hot glam in this new Instagram shot from the set of Glee.

Working on the show’s 100th episode, the two actresses joined co-stars Darren Criss, Harry Shum, Jr., Mark Salling and more for the upcoming two-parter.

“Early 80′s glam at #Glee today with @DiannaAgron,” Lea captioned with the pic.

Dianna added, “Want to dress like this every day.”

“Today was one of the best days on #Glee. Ever. @msleamichele @DiannaAgron @chriscolfer @MarkSalling @iharryshum @Matt_Morrison @MrRPMurphy,” Darren wrote on his own Twitter at the end of the day.

Can’t wait to see the episode!