• The 2019 Oscars were held in Los Angeles on Sunday night at the Dolby Theatre. 
• Major Hollywood stars, including Julia Roberts, Bradley Cooper, Lady Gaga, Emilia Clarke, Jason Momoa, and more were in attendance.
• Keep reading for a look at the best backstage moments and behind-the-scenes photos you might have missed.

The Academy Awards' backstage didn't see a dull moment during Sunday night's 2019 Oscar ceremony.

From heart-melting reunions to happy tears and massive hugs, INSIDER has gathered the best moments of the night which happened away from the live cameras and during commercial breaks.

Keep reading to see what all your favorite stars were up to backstage at the 91st Annual Academy Awards.

Stars prepared for their spotlight presentation moments backstage

Melissa McCarthy and Bryan Tyree Henry prepped for their costume design award presentation.

Chris Evans and Jennifer Lopez went over their script for presenting the Oscar for production design. 

There were hugs galore in the hallways of Dolby Theater

"Game of Thrones" co-stars and on-screen couple Jason Momoa and Emilia Clarke reunited backstage. 

Helen Mirren took a selfie with Momoa in front of all the to-be-awarded Oscar statues.

Later, Mirren snapped a picture of Serena Williams sipping some sparkling wine backstage while watching Bette Midler perform a song from "Mary Poppins Returns.'

Frances McDormand (who won best actress last year) embraced Olivia Colman after her Oscar win.

Best picture presenter Julia Roberts screamed in delight when she saw Linda Cardellini backstage. 

Stars geeked over each other, and swapped selfies or got autographs 

James McAvoy took a picture in the bathroom showing his white shirt covered in red sharpie autographs from his fellow actors.

After the ceremony McAvoy told Vanity Fair he was backstage with a crowd of stars and saw the red sharpie, and jokingly asked if they would sign his shirt. He said Brie Larson, Samuel L. Jackson, Frances McDormand, and Michael B. Jordon were among the celebrities who'd signed it.

Olivia Colman had an intimate moment with Lady Gaga after her best actress win. 

Michelle Yeoh shared this photo of her and "Crazy Rich Asians" director John Chu cozied up behind "The Favourite" stars Olivia Colman and Emma Stone. 

Lady Gaga and Bradley Cooper's performance had everyone going wild

Gaga and Cooper performed "Shallow" from "A Star Is Born," and brought down the house. 

Read more:Bradley Cooper and Lady Gaga gave an emotional and intimate performance at the Oscars, and people have feelings

When Gaga and Cooper returned to the stage so they could go take their seats, the Oscars audience gave them a second standing ovation.

Not too long afterwards, Mark Ronson, Lady Gaga, Anthony Rossomando and Andrew Wyatt won best original song for "Shallow."

Then came time for after-party celebrations

Before he could start celebrating his win for best actor, Rami Malek took a spill and fell off the main Oscars stage. 

Then Malek took celebrating to a new level when he sprayed champagne all over a room full of people at the Governor's Ball.

Julia Roberts ended the ceremony with the presentation of best picture to "Green Book." Afterward, she and Paul Rudd caught up and took a selfie. 

Read more:Paul Rudd presented at the Oscars, and fans swooned over his 'ageless' looks

Jennifer Hudson and Barbara Streisand posed together at the Vanity Fair party.

Taylor Swift didn't attend the Oscar ceremony, but was on hand for the after parties with boyfriend Joe Alwyn ("The Favourite"). 

Best adapted screenplay winner Spike Lee ("BlacKKKlansman,""Do the Right Thing") was seen speaking with "Black Panther" director Ryan Coogler at one soiree. 

And seven-time Oscar nominee Glenn Close danced the night away.

• Read more:
• Bradley Cooper and Lady Gaga gave an emotional and intimate performance at the Oscars, and people have feelings
• Lady Gaga wore a $30 million necklace to the Oscars with a 128-carat yellow diamond last seen on Audrey Hepburn
• Here's the complete list of the 2019 Oscar winners
• The best outfits celebrities wore to the 2019 Oscars

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