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    19 Famous People You Totally Forgot Were On "Big Time Rush"

    Should I say "Big Time Celebs"?

    1. Snoop Dogg

    BTR, Kelly, and Snoop Dogg sitting outside the recording studio looking confused
    Nickelodeon

    He played: Himself — he recorded a song with Big Time Rush.

    Where you know him from: He's a suuuuuper-famous rapper.

    2. Jordin Sparks

    Jordin Sparks inside a well because she fell into it.
    Nickelodeon

    She played: Herself — she fell down a well and then recorded a song with BTR.

    Where you know her from: She's a Grammy-winning singer-songwriter who rose to fame when she won Season 6 of American Idol. Since then, she's had hits like "Tattoo," "No Air," and "Battlefield."

    3. Camilla Luddington

    Camilla Luddington as Rebecca, Hawk's assistant, sitting next to Hawk and holding a coffee cup.
    Nickelodeon

    She played: Rebecca — the assistant to Gustavo's archnemesis, Hawk. She tried to sabotage BTR from performing at a concert and tied them up.

    Where you know her from: She's best known for playing Jo Wilson on Grey's Anatomy.

    4. Alexa PenaVega

    Alexa PenaVega talking to Carlos
    Nickelodeon

    She played: Herself — she teamed up with BTR to stop a spy from ruining the Tween Choice Awards.

    Where you know her from: She starred in Spy Kids, and she's Carlos PenaVega's wife IRL.

    5. Fabio Lanzoni

    Fabio hiding in a lemon tree.
    Nickelodeon

    He played: Himself — he was in a few episodes, and he tried to sell "Pocket Grillers," went on a date with Kendall's mom, and became BTR's neighbor.

    Where you know him from: He's an actor, a model, and best known for his luscious, shiny hair.

    6. Erik Estrada

    Erik Estrada wearing a police uniform and standing next to Carlos
    Nickelodeon

    He played: Officer Garcia, Carlos's dad — he helped Carlos find his missing helmet.

    Where you know him from: He's an actor who's starred on shows and in movies like CHiPs, The Bold and the Beautiful, Two Women, One Road, Loaded Weapon 1, Van Wilder: Party Liaison, and Sealab 2021.

    7. Nick Cannon

    Nick Cannon talking to BTR on the Tween Choice Award stage.
    Nickelodeon

    He played: Himself — he introduced BTR during the Tween Choice Awards.

    Where you know him from: He started acting on Nickelodeon's All That, then went on to host shows like The Nick Cannon Show, America's Got Talent, and The Masked Singer. He is also a rapper and has released numerous tracks.

    8. Lisa Rinna

    Lisa Rinna talking to BTR
    Nickelodeon

    She played: Brooke Diamond, James' mom — she tried to take James back to Minnesota so he could run her cosmetics company.

    Where you know her from: She acted in Days of Our Lives and Melrose Place, then starred as herself in The Real Housewives of Beverly Hills.

    9. Elizabeth Gillies

    Elizabeth looking confused as James and Carlos introduce themselves
    Nickelodeon

    She played: Heather Fox — Carlos and James' old friend from camp who became a model.

    Where you know her from: She's best known for playing Jade on Victorious and Fallon on Dynasty.

    10. Jon Stewart

    Nickelodeon

    He played: Himself — BTR was supposed to appear on his show.

    Where you know him from: He hosted The Daily Show from 1999 to 2015. He's also a bestselling author, director, and producer.

    11. Keegan Allen

    Keegan Allen doing a model pose with his hand on his face
    Nickelodeon

    He played: A model.

    Where you know him from: He's best known for playing Toby Cavanaugh on Pretty Little Liars.

    12. Russell Brand

    Russell talking on the phone while Katie tries to get him to sign a contract
    Nickelodeon

    He played: Himself — Katie tried to become his manager, but he refused.

    Where you know him from: He's a comedian and an actor best known for his appearances on Big Brother, Get Him to the Greek, Forgetting Sarah Marshall, and more.

    13. Alfonso Ribeiro

    Alfonso Ribeiro riding with a helmet on a segway
    Nickelodeon

    He played: Block Captain McCallister.

    Where you know him from: He played Carlton on The Fresh Prince of Bel-Air, Alfonso on Silver Spoons, and Dr. Maxwell Stanton on In the House. Currently, he hosts America's Funniest Home Videos.

    14. Miranda Cosgrove

    James and Carlos carrying in Miranda as they all sing "All I Want For Christmas Is You"
    Nickelodeon

    She played: Herself — she recorded a Christmas song with BTR.

    Where you know her from: She's best known for starring on Nickelodeon's iCarly and Drake and Josh.

    15. Cher Lloyd

    James singing with Cher Lloyd
    Nickelodeon

    She played: Herself — she recorded a song with James.

    Where you know her from: She was on the seventh season of X Factor and released a bunch of music during the early 2010s. Her hits include "Want U Back," "With Ur Love," and "Swagger Jagger."

    16. Lucas Cruikshank

    Lucas Cruikshank waving to BTR
    Nickelodeon

    He played: Himself — he was a guest at the hotel BTR lived in.

    Where you know him from: He's best known for his YouTube character Fred Figglehorn.

    17. Gavin DeGraw

    Gavin Degraw talking to BTR about a song
    Nickelodeon

    He played: Himself — he was trying to produce a new song.

    Where you know him from: He's a singer-songwriter best known for "I Don't Want to Be," along with many other hits, including "Not Over You," "Follow Through," and "Chariot."

    18. Austin Mahone

    Austin Mahone smiling at the Tween Choice Awards
    Nickelodeon

    He played: Himself — he was a guest and nominee at the Tween Choice Awards.

    Where you know him from: He's a singer-songwriter who rose to fame after posting videos of himself singing on YouTube. His hits include "Say Somethin" and "Say You're Just a Friend."

    19. Victoria Justice

    Victoria Justice talking about her concert
    Nickelodeon

    She played: Herself — she was the opening act at BTR's concert.

    Where you know her from: She's best known for her roles in Zoey 101 and Victorious.

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