Show Crashers: When Music Stars Make Uninvited Appearances

These unexpected guests gave us moments to remember.

Papoose Rocks Kendrick Lamar Set - Hip hop fans were a bit bewildered at Hot 97's 20th annual Summer Jam when Kendrick Lamar, immediately following his set, turned the stage over to self-proclaimed King of New York, Papoose. Even though the unannounced performance was planned, it still looked like Pap was pulling off yet another univited stage moment by a rapper. Here's a look at other moments of unexpected appearances.   (Photo: Courtesy of Hot97 Live)

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Papoose Rocks Kendrick Lamar Set - Hip hop fans were a bit bewildered at Hot 97's 20th annual Summer Jam when Kendrick Lamar, immediately following his set, turned the stage over to self-proclaimed King of New York, Papoose. Even though the unannounced performance was planned, it still looked like Pap was pulling off yet another univited stage moment by a rapper. Here's a look at other moments of unexpected appearances.  (Photo: Courtesy of Hot97 Live)

Lil' Mama's Crashes "Empire State of Mind" - At the 2009 MTV Video Music Awards Lil' Mama was so moved by Jay-Z and Alicia Keys's performance of "Empire State of MInd," she thought she'd join them on stage. Jay-Z's "W.T.H." look at the young femcee trying to get in on the act was priceless. (Photo: Kevin Mazur/WireImage)

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Lil' Mama's Crashes "Empire State of Mind" - At the 2009 MTV Video Music Awards Lil' Mama was so moved by Jay-Z and Alicia Keys's performance of "Empire State of MInd," she thought she'd join them on stage. Jay-Z's "W.T.H." look at the young femcee trying to get in on the act was priceless. (Photo: Kevin Mazur/WireImage)

Ol' Dirty Bastard  - Ol' Dirty Bastard and Kelis rocked out on their 1999 hit "Got Your Money" as the Neptunes sampled M.J.'s classic "Billie Jean" for Dirt McGirt's club banger.  (Photo: Reuters Photographer / Reuters)

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ODB at the 1998 Grammy Awards - At the 1998 Grammys, the Wu Tang Clan was nominated for Best Rap Album and lost. But it was later, when the winner of the Song of the Year catagory was announced, that Wu member Ol' Dirty Bastard grabbed the mic to express his disappointment at Wu's loss. "I went and bought me an outfit today that costed a lot of money...", began his famous "Wu is for the children" speech. (Photo: Reuters Photographer / Reuters)

KRS-One Brings Thunder to P.M. Dawn - Anyone who knows hip hop music  pioneer KRS-One (Kris Parker) knows he takes his title as "teacher" very seriously. Prince Be of early '90s alterna-rap group P.M. Dawn learned the hard way when he asked during an interview, "KRS... wants to be a teacher, but a teacher of what?"  During a P.M. Dawn performance at a New York City club, Kris stormed the stage with his BDP posse, threw Prince Be off stage and proceeded to perform three of his own classics for the shocked crowd.    (Photos from left: Larry Busacca/Getty Images, Steve Eichner/WireImage)

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KRS-One Brings Thunder to P.M. Dawn - Anyone who knows hip hop music  pioneer KRS-One (Kris Parker) knows he takes his title as "teacher" very seriously. Prince Be of early '90s alterna-rap group P.M. Dawn learned the hard way when he asked during an interview, "KRS... wants to be a teacher, but a teacher of what?"  During a P.M. Dawn performance at a New York City club, Kris stormed the stage with his BDP posse, threw Prince Be off stage and proceeded to perform three of his own classics for the shocked crowd.  (Photos from left: Larry Busacca/Getty Images, Steve Eichner/WireImage)

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Kanye West Interrupts Taylor Swift at the VMAs - When Taylor Swift beat out Beyoncé for Best Female Video at the 2009 MTV Video Music Awards, Kanye West hit the stage, grabbed the mic from Ms. Swift and gave the world a piece of his opinion. "I'm sorry, but Beyoncé had one of the best videos of all time!" Unfortunately, that defense of Bey turned Kanye into a piriah. Even President Obama had words for him. (Photo: Christopher Polk/Getty Images)

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50 Cents Takes the Stage at the Grammys - 50 Cent, who lost Best New Artist at the 2004 Grammys, decided to interrupt Evanescence (the actual winners) during their acceptance speech. He simply walked on with them and then walked off... like a sore looser. (Photo: Frank Micelotta/Getty Images)

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50 Cents Takes the Stage at the Grammys - 50 Cent, who lost Best New Artist at the 2004 Grammys, decided to interrupt Evanescence (the actual winners) during their acceptance speech. He simply walked on with them and then walked off... like a sore looser. (Photo: Frank Micelotta/Getty Images)

T-Pain Joins Jay-Z in the Death of Auto-Tune - At Hot 97's Summer Jam in 2009 Jay-Z rocked his latest hit "D.O.A. (Deat of Auto-Tune)," which not only dissed artists's overuse of the voice-changing device but the artist who popularized the machine: T-Pain. As the crowd cheered, they were surprised when T-Pain joined Jay on stage to help in shouting down Auto-Tune.    (Photo: Johnny Nunez/WireImage)

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T-Pain Joins Jay-Z in the Death of Auto-Tune - At Hot 97's Summer Jam in 2009 Jay-Z rocked his latest hit "D.O.A. (Deat of Auto-Tune)," which not only dissed artists's overuse of the voice-changing device but the artist who popularized the machine: T-Pain. As the crowd cheered, they were surprised when T-Pain joined Jay on stage to help in shouting down Auto-Tune.   (Photo: Johnny Nunez/WireImage)

Kanye Rants At the MTV Europe Music Awards - Known for his stage storming antics during the VMAs, in '06 he decided to go global, taking the stage at MTV Europe Music Awards in Copenhagen, Denmark. Why? Because he didn't win the Best Video Award. At least he informed the crowd he'd been drinking prior to his tirade.    (Photo: Dave Hogan/Getty Images for MTV)

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Kanye Rants At the MTV Europe Music Awards - Known for his stage storming antics during the VMAs, in '06 he decided to go global, taking the stage at MTV Europe Music Awards in Copenhagen, Denmark. Why? Because he didn't win the Best Video Award. At least he informed the crowd he'd been drinking prior to his tirade.   (Photo: Dave Hogan/Getty Images for MTV)