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There’s a lot of pressure when it comes to putting on an episode of Saturday Night Live: it is live, after all.

As a result, cast members and hosts need to stick to their scripts closely in order to keep the sketches flowing smoothly – and they also need to keep a straight face as they fly through dozens of jokes every night. But what happens when they…can’t?

Time and time again, we’ve watched over the years as the cast of SNL, and myriad celebrity hosts, absolutely lose it after cracking up at one of the jokes they’ve said, the sheer absurdity of the sketch, or something entirely unexpected happening in a scene. In most cases, it only makes the sketch even more hilarious for the audience watching at home.

We’ve rounded up some of the best moments where the SNL stars have absolutely lost it during a sketch.

Check out all the times Saturday Night Live stars broke character inside…

Ariana Grande hits the stage with some of the legendary cast members of Saturday Night Live for a recreation of one of their Christmas songs!

The 25-year-old singer joined Jimmy Fallon, Tracy Morgan, Chris Kattan, and Horatio Sanz to perform “I Wish It Was Christmas Today” on The Tonight Show on Tuesday (December 18) in New York City.

The four guys performed the song together on SNL ten years ago.

Ariana didn’t sing during the performance. Instead, she stood in between Chris and Tracy and bopped to the music.

Click inside to watch the original video… More Here! »

Amy Poehler stepped out for another night with Upright Citizen Brigade!

The actress and SNL alum took the stage at UCB’s 20th Annual Del Close Improv Marathon press conference on Friday (June 29) at UCB Theatre in New York City.

PHOTOS: Check out the latest pics of Amy Poehler

She was also joined at the event by Jack McBrayer, Matt Besser, Matt Walsh, Horatio Sanz and Ian Roberts as they did some fun improv sketches.

The night before, Amy reunited with her SNL co-star Tina Fey at UCB’s ASSSSCAT event.

Make sure to check out the photos of their cute reunion!

Tina Fey and Amy Poehler share a cute moment together on stage at ASSSSCAT with the Upright Citizen Brigade Live on Thursday (June 28) at Carnegie Hall in New York City.

Amy joined Matt Besser, Ian Roberts, and Matt Walsh for the show, which also featured special guests Rachel Dratch and Horatio Sanz.

Tina was the guest monologist for the show and the improvisers used her impromptu monologue to create balls-to-the-wall improvised sketches.

The special show at Carnegie Hall was held to celebrate the 20th anniversary of UCB’s Del Close Marathon.

Amy Poehler keeps it casual for the 2015 Del Close Improv Comedy Marathon Press Conference held at the Upright Citizens Brigade (UCB) Theatre on Saturday night (June 27) in New York City.

The 43-year-old actress and comedian was joined by Saturday Night Live pals Bobby Moynihan and Horatio Sanz, as well as The Unbreakable Kimmy Schmidt‘s Ellie Kemper.

“If the goal is doing good stuff and working with your friends…if you’re doing that then you’re succeeding,” Amy told the crowd (via People). “If the goal is to be famous and make money – then you’re in real trouble.”

Amy added, “It happens rarely and when that is your goal – being famous and making money – then you’re not paying attention to the things that will make you money.”

15+ pictures inside of Amy Poehler, Ellie Kemper, and more at the event…More Here! »