Ellen was joined by the diverse trio of stars for a surprising game of "Never Have I Ever"!

This incredible duo teamed up to perform an 'original' song for Ellen! They may not have had a lot of rehearsal, but it's clear that this is one musical combo it would be great to hear a lot more of. #TaylorSwift #ZacEfron #TheEllenShow

Adele sure can sing, but can she beat the clock? Watch what happened when Ellen challenged her to a game of 5 Second Rule!

Ellen and Sofia played a hilarious game of 5 Second Rule! Check it out, plus all the fun we didn't have time for in the show!

Breakout rapper Cardi B didn't hold back as she and Ellen played a round of "5 Second Rule."

For her 2,498th show, Ellen revisited all the hilarious times things didn't go exactly as planned.

Even though Ellen is 15 seasons in, it doesn't mean everything goes off without a hitch. Take a look back at some of the funniest, unexpected moments over the years.

Simon Cowell is an expert at finding talent, but Ellen found out that Simon Cowell isn't the best at following instructions. Watch as the "America's Got Talent" judge answers "Burning Questions" about his first celebrity crush, and which member of "One Direction" he thinks is the sexiest. #SimonCowell #TheEllenShow #BurningQuestions

The actors showed off their super dance skills in Ellen's fun new game! Find out more about Shutterfly here: https://www.shutterfly.com/ #ChrisEvans #ElizabethOlsen #Avengers

Andy and the music star had a spooktacular time during their visit to a creepy haunted house for Halloween!

Ellen played a game with Scarlett Johansson and Chris Evans to find out how well they know each other. #ScarlettJohansson #ChrisEvans #Avengers

She loves to scare her guests. Take a look at a few of these recent favorites!

Jennifer Lawrence was in the hot seat for Ellen's "Burning Questions," and we learned a lot about her hypochondria, and relationship with her dog Pippi.

Kim, Kourtney, and Kendall have all answered Ellen's Burning Questions, now it's Khloe's turn to take the hot seat in a round of "Burning Questions: Pregnancy Brain Edition!"

The presidential expert got to meet a President for the first time, and asked him some very important questions.

Kris Jenner had the ultimate Mother's Day surprise as Ellen brought out Kourtney Kardashian, her kids Mason, Penelope, and Reign, and Kim's children, North, Saint, and Chicago. Kim was noticeably absent as Kourtney revealed to her mom that Kim's surrogate is in labor, and her fourth child is on the way! #KrisJenner #KourtneyKardashian #KimKardashian

Sandra Bullock talked to Ellen about being blindfolded in her new movie "Bird Box," and how she found it really easy to yell at her on-screen kids. #SandraBullock #BirdBox #TheEllenShow

Find out who Sandra Bullock wants to do a love scene with, and how drag queens helped her make money, as the Oscar winner answered Ellen's Burning Questions. For more Shutterfly moments, go to: https://www.ellentube.com/campaigns/shutterfly.html

They were staked out in the bathroom for this hilarious round of scares!

To help prepare the First Lady for life after the White House, Ellen took her to CVS Pharmacy to pick up a few things.

The “Bright” actor and Ellen reveal what you should and shouldn’t do in the car during a game of 5 Second Rule.

For her classic hidden camera prank, Ellen sent a nurse into Bruno Mars' dressing room for a medical session she'll never forget! Check out what happened, here!

During Sandra Bullock's last visit to the show, she admitted she had a bit of a crush on her "Speed" co-star Keanu Reeves when they were filming. So today, Ellen asked Keanu about any possible feelings for his longtime friend – and he divulged he had a crush on her too! #KeanuReeves #SandraBullock #Speed

She went to pick up a few things for the holidays, and had some fun with Target shoppers! http://www.target.com

Even though Trevor Noah has a mention in People magazine's Sexiest Man Alive issue, he's still single, so Ellen helped him find a potential girlfriend with a game of "Who'd You Rather?" Find out who he chose between Jennifer Aniston, Nicki Minaj, and Khloé Kardashian (who Ellen was willing to hook him up with). #TheEllenShow #TrevorNoah #TheDailyShow

Since one of Jason Momoa's hobbies is ax throwing, Ellen tested his skills (and he taught Ellen a few too), all to raise money for a Hawaii-based organization aimed at saving the environment. For more Shutterfly moments, go to: https://www.ellentube.com/campaigns/shutterfly.html #JasonMomoa #TheEllenShow #Aquaman

Nate is a preschooler whose love for geography, countries, flags, and more has really put him on the map!

P!nk sat in the hot seat and answered some of Ellen's "Burning Questions." Find out the craziest rumor about her she's ever heard, and why slashing tires was the dumbest way she's hurt herself. #TheEllenShow #P!nk #Ellen

Ellen and her funny friend Steve Harvey spent some time talking to kids about beauty. Everyone learned something new, even Ani!

"Lady Bird" star Saoirse Ronan isn't a big fan of dating apps, so Ellen decided to play matchmaker herself with a round of "Who'd You Rather?"

The "American Horror Story" star and Ellen’s executive producer Andy Lassner go through a haunted house together. It’s the first and last time Sarah Paulson agreed to do something Ellen asked. Beware... lots of screaming and foul language in this one.

Guest host Kristen Bell was left hanging as she and her mom played against Jamie Foxx and his daughter Corinne in a hilarious round of "You Bet Your Daughter"!

Apparently, Noah Ritter loves dinosaurs, Ellen's PA Robby, and pizza, and apparently, Ellen can't get enough of these fun moments she shared with him.

Leonardo DiCaprio is quite the daredevil, and he told Ellen about a few of his close calls!

It's Halloween season, which means it's time for Ellen to send her Executive Producer Andy through a haunted house, and this time around, she sent her friend Chrissy Teigen with him! Find out who gets scared easier as they encounter real mannequins, people swinging cleavers around, and mysterious creatures crawling on the floor. #ChrissyTeigen #AverageAndy #TheEllenShow

“Avengers: Endgame” stars Scarlett Johansson and Brie Larson joined forces to play against Ellen and tWitch in a trivia game called “Who Saves the World? Girls!” #ScarlettJohansson #BrieLarson #Avengers

Global phenomenon BTS sat down with Ellen for their U.S. daytime TV debut, and talked about their loyal BTS Army and learning English from "Friends"!

The artists at Madame Tussauds recently made a new wax figure of Zac Efron, and Ellen surprised him by bringing it to the show – where the Hollywood hunk showed off his real abs to see if the wax figure was truly realistic! #ZacEfron #TheEllenShow #Ellen

It was Margot Robbie's first time on the show, but she and Ellen met before... the story involves Tahiti, a presidential guest, and her new husband's super short shorts. You'll have to hear it to believe it!

Rap superstar and new dad Travis Scott sat down with Ellen to talk about his hit record, "Astroworld," aspirations to return to his musical roots, writing a Broadway-inspired album, and how he learned what a placenta is while in the delivery room with girlfriend Kylie Jenner and her mom Kris Jenner while welcoming his daughter Stormi. #TravisScott #TheEllenShow #KylieJenner

The YouTuber and "TRL" host answers Ellen’s most probing questions, including her most embarrassing moment in high school, a video she regrets posting, and which celebrity has recognized her.

Sarah Paulson admitted to Ellen it was a daily struggle not to embarrass herself (and sing) in front of her new friend Rihanna while filming their movie, "Ocean's 8."

It's been 10 years since Ellen gave Jeannie her first-ever job, and to celebrate the milestone, Ellen shocked Jeannie with an unforgettable surprise.

“Daddy’s Home 2” actors Mark Wahlberg and Will Ferrell tested their elementary school knowledge against a whiz kid in “Does Daddy Really Know Best?”

Ellen's friend Steve Harvey told a hilarious story of how he ended up with an $8,500, 16-foot teepee in his backyard.

Oscar winner Jennifer Lawrence described to Ellen her drunk alter ego "Gail," who loves rum and jumping into shark-infested waters.

In this exclusive, never seen on TV clip, the 25-year-old singer checks out some potential love interests Ellen picked for him. He also spills the T about his new relationship.

Billie Eilish spoke candidly with Ellen about living with Tourette Syndrome, and why she decided to go public with it only last year. Plus, the 17-year-old pop star talked about celebrities like Paul McCartney and Sporty Spice, who she couldn’t believe were fans of hers. #TheEllenShow #BillieEilish #Ellen

Shin Lim recently won "America's Got Talent: The Champions," and now he's back on Ellen to prove why he beat all the other "Got Talent" winners with an astonishing card trick. #TheEllenShow #ShinLim #AmericasGotTalent

Comedy legend Lily Tomlin explained to Ellen why she turned down an offer from Time magazine to be on the cover of a 1975 issue in which she would have come out as gay. Plus, Lily and her "Grace and Frankie" co-star Jane Fonda chat about a sequel to their beloved movie "9 to 5," and what Lily plans to do for her 80th birthday later this year. #LilyTomlin #JaneFonda #TheEllenShow