Boy bands have been taking the world by storm for decades, living in people's radios, iPods,90 or Spotify playlists. And while plenty have had their music featured on the soundtracks of television shows and movies, some boy bands took it a step further, turning into triple threats when they stepped out onto people's TV screens in guest-starring roles on popular TV shows.

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Though some of these boy band members are also accomplished actors — some even starring in their own series — surprising an audience by popping up on TV alongside your fellow bandmates brings on a whole new dynamic, not to mention a lot of views.

New Kids On The Block, Fuller House (2016)

New Kids On The Block On Fuller House

Though it's not mentioned when DJ and Kimmy were teenagers on Full House, as adults on the Netflix spin-off Fuller House, the best friends never hide their obsessions with New Kids On The Block. Kimmy is especially a self-proclaimed "Blockhead." So when she accidentally gets DJ counterfeit tickets for her birthday, the house gets even fuller when NKOTB stop by for a little pre-show to wish one of their biggest fans a happy birthday.

Though the Boston-based boy band consists of two known actors, one wasn't able to make this guest appearance. Due to filming Blue Bloods, Donnie Wahlberg had to miss out on singing "Happy Birthday" to DJ, though he does appear via video chat dressed in his Danny Reagan attire.

Backstreet Boys, Sabrina The Teenage Witch (1998)

Backstreet Boys On Sabrina The Teenage Witch

What happens when you combine one of the hottest shows of the '90s with one of the hottest boy bands? It's magic, of course. When Sabrina brews up bottles of talent to help her band win a competition, one ends up in the wrong hands — five sets of hands, to be exact. After all of Backstreet Boys take sips of the talent, they drop the basketball they're playing with and break out into their hit "As Long As You Love Me."

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The show ends with the band continuing the song for a gymnasium full of students, including Sabrina. Despite the members acquiring a list of acting gigs on their own, this was the Backstreet Boys' only acting credit as a band.

Boyzone, General Hospital (1999)

Boyzone Ronan Keating On General Hospital

Hot off their European tour, Irish hit-makers Boyzone stopped by Port Charles, of all places, to serenade the cast of daytime drama General Hospital. The band performed their biggest hit, "No Matter What," for all of Luke's club, including the show's then-teenage group: Elizabeth, Nikolas, Emily and Juan.

This was Boyzone's second guest appearance on a television show, their first being on the UK comedy Zig And Zag's Dirty Deeds.

One Direction, iCarly (2012)

One Direction On iCarly

In the midst of the One Direction takeover of 2012, the band made a guest appearance on the fifth season of Nickelodeon's iCarly. When Carly invites the band on her web show, a slew of antics ensues, including Sam falling for Zayn and Harry falling ill with "jungle worms." In the end, the boys perform "What Makes You Beautiful" for all of iCarly's online viewers.

The One Direction members have had a long repertoire of guest stints and commercials, but only Harry Styles — who had the biggest role in "iGo One Direction" — has continued wracking up acting credits, most recently as Starfox in Marvel's Eternals.

Jonas Brothers, Hannah Montana (2007)

Jonas Brothers And Billy Ray Cyrus On Hannah Montana

Somewhere between their film debut in Camp Rock and starring in their own Disney Channel series JONAS, the band of brothers made a guest appearance on Hannah Montana. Kevin, Joe and Nick appear as themselves alongside Nick's former crush, Miley Cyrus' popstar persona. Rather than fanboying over Hannah Montana, the brothers find themselves fanboying over her songwriter father.

The band ends up collaborating with Hannah. Their song "We Got The Party" was featured on Hannah Montana's sophomore album and later performed during the Best of Both Worlds Tour, which featured the Jonas Brothers as Cyrus' opening act.

Boyz II Men, Fresh Prince Of Bel-Air (1993)

Boyz II Men On The Fresh Prince Of Bel-Air

Fresh Prince of Bel-Air's season 4 Christmas episode featured special guests Boyz II Men, who Will attempts to book to perform at his cousin's christening by sneaking into the band's holiday recording session. After antics involving eating the group's doughnuts and a stolen Santa outfit, the group shows up at the church singing "Silent Night."

While this was one of the band's first acting stints, the group still appear on television shows to this day, their most recent guest star appearance being on the 2017 NBC series Marlon.

Beach Boys, Full House (1988, 1990, 1992)

Beach Boys On Full House

The Beach Boys and Full House alum John Stamos have had a decades-long friendship which resulted in band members making several appearances on the '80s sitcom. Their first guest spot was in season 2, when DJ wins tickets to their concert and whole house argues over who gets to join her until The Beach Boys themselves show up to let them know they're all invited.

The band's other Full House appearances include them joining the Tanner home for a jam session in Jesse's recording studio, and Mike Love unexpectedly shows up to celebrate Wake Up, San Francisco's telethon reaching its goal.

N*SYNC, Sabrina The Teenage Witch (1999)

NSYNC-On-Sabrina-The-Teenage-Witch-2

Sabrina, The Teenage Witch was home to a lot of popstar guest stars in the '90s, and in season 3, they got a special appearance by N*SYNC. After 17-year-old Sabrina snags a fake I.D. from the "Other Realm" in order to get into an over-18 club to see N*SYNC perform, she later faces the consequences when she learns because her I.D. is fake, now so is her magic.

While they made several guest appearances during their run as a band, some members also found themselves with solo acting and producing careers, most notably Justin Timberlake's TV and film credits and Lance Bass' endeavor to produce an N*SYNC movie.

Big Time Rush, Marvin Marvin (2013)

Big-Time-Rush-On-Marvin-Marvin-1

In the one-hour series finale of Nickelodeon's Marvin Marvin, fellow Nickelodeon stars Big Time Rush appear as themselves. When the band is kidnaped and replaced by alien lookalikes, it's up to Marvin and his pals to save the band from their extraterrestrial captors.

While Big Time Rush starred in their own series of the same name, this marked the second time the band guest-starred on a Nickelodeon show, the first being in 2012 with a guest stint on How To Rock.

98 Degrees, Just Shoot Me! (2000)

98 Degrees On Just Shoot Me

Season 5 of NBC's late 90's-early 2000's hit Just Shoot Me! included a guest appearance by 98 Degrees. Finch's new band, called "2 Fine," features all four members of 98 Degrees, who perform their Y2K hit "Give Me Just One Night (Una Noche)" alongside David Spade's character.

Before their Just Shoot Me! stint, the band had a guest-starring role on ABC's General Hospital primetime spin-off Port Charles in 1999.

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