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This little know-it-all on 'Drake & Josh' became an even bigger child star in the lead role of her own Nickelodeon show, 'iCarly.'

▲Trainor brought his quirkiness to both 'Drake & Josh' and 'iCarly' with Miranda Cosgrove.

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All grown up, the actress is most famous for lending her voice to the 'Despicable Me' franchise. She also went to the University of Southern California, where she studied both film and psychology. More recently, she's back in the role she's known best for, starring in the 'iCarly' reboot.

▲The world first knew and loved him as Freddie Benson in 'iCarly' as well as the spin-off 'Sam & Cat.'

▲He's since voiced the title character on 'T.U.F.F. Puppy,' and voiced two characters in the animated 'Transformers: Robots In Disguise' series. You can also catch him in the 'iCarly' reboot.

▲She reunited with 'iCarly' co-star Nathan Kress in 2017 for a short which she also co-wrote and co-directed. She decided to pursue a career in acting and directing and quit acting in 2017. In 2022, she released a best-selling memoir titled 'I'm Glad My Mom Died,' in which she detailed the abuse she suffered at the hands of her mother and other adults as a child star.

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Of course, now her music career has entirely eclipsed her acting career, and she continues to break the internet.

▲Starting out as Lola on 'Zoey 101,' Justice later earned a starring role on 'Victorious.'

▲Though you know her well now, Grande got her big break on 'Victorious,' and later starred in the spin-off 'Sam & Cat.'

▲The dorky Robbie from 'Victorious' finally split from Rex the puppet...

▲McCurdy got her start on 'iCarly' and later starred in the spin-off 'Sam & Cat.'

▲Jogia co-starred with Victoria Justice in a comedy called 'The Outcasts,' and starred in the thriller 'The Drowning' as well as the sci-fi show 'Ghost Wars.'

▲He directed some Nickelodeon shows, became a husband and a father, and lent his voice to the Netflix cartoon 'Pinky Malinky.' He too returned for the reboot.

▲Gillies got her first big acting debut co-starring on 'Victorious.'

▲Mitchell starred in the hit shows 'All That' and 'Kenan & Kel.'

▲He's been on 'Game Shakers' and 'Dancing with the Stars,' and established himself as a stand-up comedian, musician, singer, and rapper.

▲And he went on to guest-star on shows like 'The Big Bang Theory,' 'Shameless,' 'Fresh Off the Boat,' and 'American Vandal.' He also appeared in Ariana Grande's 'Thank U, Next' music video.

▲Her most notable role since then is on the show 'Dynasty.'

▲If viewers thought the 'Victorious' star was a high school heartthrob, wait until you see him all grown up.

▲He voiced the animated Spider-Man, and established a music career for himself as well.

▲Thompson first started making people laugh on 'All That' and 'Kenan & Kel.'

▲This adorable face accompanied Bell the whole way, from 'All That,' to 'The Amanda Show,' and then to 'Drake & Josh.'

▲From 'All That,' to 'The Amanda Show,' to 'Drake & Josh,' Bell was Nickelodeon royalty.

▲Now he's best known for his hilarious work on 'Saturday Night Live.'

▲The transformation is inspiring! He's shared YouTube vlogs, a podcast, and he's been acting in films like 'Take the 10' and 'Locating Silver Lake.' But his recent TV work is more notable: the 'Turner & Hooch' series and 'How I Met Your Father.'

▲Palmer's Nickelodeon claim to fame was the lead role in 'True Jackson, VP.'

▲After 'All That,' Spears got her own show, 'Zoey 101.' When she announced she was pregnant at age 16, however, she sent her career into hiatus.

▲Argota played Lulu in 'True Jackson, VP.'

▲She's now recognized as Lou, an edgy musician on 'The Fosters.' She's continued to work on other shows and co-starred with fellow Nickelodeon alum Drake Bell in the film 'Cover Versions.'

▲In 2013, however, she launched a country music career for herself, and in 2019 she was cast as a series regular in the upcoming romance drama series 'Sweet Magnolias.' And excitingly, in early 2023 she announced a 'Zoey 101' reboot.

▲Destined for greatness, Palmer became the first African-American actress to portray Cinderella on Broadway. She also appeared in 'Scream Queens,' established a music career, wrote a book, launched her own label, and starred in 2022's 'Nope.'

▲This tiny guy played Zoey's trouble-making little brother Dustin on 'Zoey 101.'

▲Who could forget the endearing Chase Matthews on 'Zoey 101'?

▲The young actress played the science-loving oddball Quinn Pensky in 'Zoey 101.'

▲He's since revealed himself to be quite the singer, releasing his first original song, 'Ain't Hurtin' Nobody,' in 2017.

▲She's since appeared on shows like 'Mad Men' and 'Melissa & Joey,' as well as the movie 'Limelight.'

▲Remember when Roberts was the epitome of the awkward middle school phase on 'Unfabulous'?

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His most viral moment since then was a 2015 video where 10 years later his character, Chase, almost proposes to his girlfriend until he realizes he's still not over Zoey.

▲She's since starred in series like 'American Horror Story' and 'Scream Queens,' as well as films like 'We're the Millers,' 'Nerve,' and 'Billionaire Boys Club.'

▲Calloway co-starred with Emma Roberts on 'Unfabulous.'

▲Who remembers the show where a puppet comes to stay with his human family? Those strange memories are thanks to 'Cousin Skeeter.'

▲Formerly known as Lil' Romeo, Miller was in a very on-brand show called 'Romeo!'.

▲He's continued acting and making music, guest starring on 'Empire,' and he also starred in the reality series 'Growing Up Hip Hop.'

▲The actress is now better known for appearing in 'Think Like A Man,' and in 2019 she tried her hand at a thriller in 'The Intruder.' Since 2021 she's been starring on the series 'Harlem.0

▲Nat is the older half of the 'The Naked Brothers Band,' which was essentially an embellished parody of the Wolff brothers' real lives.

▲Now he's best known for his role as Chuck Clayton on 'Riverdale,' as well as being a main cast member on 'Black Lightning.'

▲He grew all the way up since then, with notable roles in 'Jumanji: Welcome to the Jungle,' and the horror film 'Hereditary.' He also stars in 2019's 'Human Capital.'

▲This tiny star was the drummer in 'The Naked Brothers Band.'

▲Don't forget the guitarist from 'The Naked Brothers Band,' who was an honorary brother.

▲He later starred in films like 'The Fault in Our Stars' and 'Paper Towns,' and performed in the Off-Broadway play 'Buried Child,' along with continuing to make music.

▲More people in the world knew him as "Ned" from 'Ned's Declassified School Survival Guide' than "Devon" when he was growing up.

▲He continues to give advice on YouTube, and he's also starred in several movies, including 'Sundown' and 'Where's the Money.' Plus, he's a singer-songwriter on the side.

▲Shaw got her big break as Moze, one of the reliable best friends on 'Ned's Declassified School Survival Guide.'

▲Lee played the lovable nerd Cookie on 'Ned's Declassified School Survival Guide.'

▲Serratos first became known as Suzie on 'Ned's Declassified School Survival Guide.'

▲She went on to star in the '10 Things I Hate About You' series, and then had a recurring role on 'Pretty Little Liars.'

▲Along with this huge transformation, Lee also established himself as a rapper and reportedly graduated with honors from California State University.

▲Butler started as a background character on 'Ned's Declassified School Survival Guide' and later became a love interest on 'Zoey 101.'

▲After starring on 'All That,' the young actress earned her own sketch series called 'The Amanda Show.'

▲He later went on to appear in several high-profile television shows, but it's his work on the big screen that got him major attention. We're talking, of course, about his Oscar-nominated starring role in 2022's 'Elvis.'

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Unfortunately, she's since had trouble with the law, as well as struggled with drugs and alcohol addiction. What's more, she's been plagued by mental health issues.

▲Middleton went on to play DJ Big Planet on Netflix's 'The Get Down,' and he was a finalist on Season 14 of 'American Idol.'

▲Since then, she notably starred in 'The Rocky Horror Picture Show: Let's Do the Time Warp Again,' and 'Naomi and Ely's No Kiss List.'

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She later appeared in the 'Twilight' franchise, 'The Secret Life of the American Teenager' series, and 'The Walking Dead.'

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Usually the Disney child stars are quite memorable for their downward spirals and rehab stints, but there are quite a few other stars you'll encounter at the cinema (think: Keke Palmer), on the radio (Ariana Grande), or on your TV (Kenan Thompson) who got their start early on the Nickelodeon network. And then there are the ones who made a big splash on beloved shows like 'All That,' but who seem to have disappeared off the face of the earth...

But they've been out there, and they've grown far past puberty. Click through to see the incredible transformations of these child stars.