iCarly was the most Famous Teen Sitcom for 5 years , and how time has past! The actors of the show have certainly changed a lot over these years .
iCarly is an American teen sitcom that ran on Nickelodeon from September 8, 2007 until November 23, 2012. The series was created by Dan Schneider. It focuses on teenager Carly Shay, who creates her own web show called iCarly with her best friends Sam Puckett and Freddie Benson. Source - http://en.wikipedia.org/wiki/ICarly
So anyway lets stick to the main Stars of the Show ...
Miranda Cosgrove ( Carly )
Then and Now , she's just getting prettier ...
Miranda Taylor Cosgrove (born May 14, 1993) is an American actress, singer, and songwriter. Her career began at the age of three, when she appeared in television commercials. Her film debut came in 2003, when she played Summer Hathaway in School of Rock. She appeared in a number of minor television roles over several years before coming to prominence as Megan Parker on the Nickelodeon TV series Drake & Josh. A few years later, she landed the role of Carly Shay, the lead character in the Nickelodeon TV series iCarly. Source - http://en.wikipedia.org/wiki/Miranda_Cosgrove
Lets go to the next actor ...
Jennette McCurdy ( Sam )
Jennette Michelle Faye McCurdy (born June 26, 1992) is an American actress, producer, screenwriter, and singer-songwriter. She is known for her role as Sam Puckett on the Nickelodeon sitcom iCarly and its spin-off series Sam & Cat. Source - http://en.wikipedia.org/wiki/Jennette_McCurdy
Nathan Kress ( Freddie)
Well he changed the most for my oppinion , he got hotter ...
Nathan Karl Kress (born November 18, 1992) is an American actor. He was also a professional child model. Kress has acted since the age of three and is known for his role as Freddie Benson on the Nickelodeon television series iCarly. Source - http://en.wikipedia.org/wiki/Nathan_Kress
Jerry Trainor ( Spencer)
Gerald William "Jerry" Trainor (born January 21, 1977) is an American actor, widely known for playing Crazy Steve on Drake & Josh and Spencer Shay on iCarly. He also voices the title character Dudley Puppy on T.U.F.F. Puppy, as well as appearing on the web series Hungry Girl TV. Trainor most recently played Vinnie in the Nickelodeon show Wendell & Vinnie. Source - http://en.wikipedia.org/wiki/Jerry_Trainor
NEXT WE HAVE GIBBYYY
Noah Munck ( GIBBY )
Noah Munck (born May 3, 1996) is an American actor and trap/electronica producer. Noah Munck produces trap music under the name NoxiK. His roles have included Gibby in iCarly and Bobby Sinclair, the junior lawn-mowing entrepreneur in the TruGreen commercials. Munck was also cast in a proposed new Nickelodeon show, Gibby. The pilot was ordered, but the series was not picked up. Source - http://en.wikipedia.org/wiki/Noah_Munck
So who changed the most ? For my self i think , Freddie !!!