Per Celebrity Net Worth, Nathan Kress is indeed a millionaire — he's believed to have a total net worth of around $1.5 million, in no small part due to "iCarly" and his subsequent acting career.

However, "iCarly" wasn't where the journey started for the 28-year-old actor. He started out as a child model as a toddler, and appeared in a few different print and television commercials. He then landed a role in the movie, "Babe: Pig in the City," as just a tiny little kid. At six, he stepped away from acting to concentrate on school and having a regular childhood for a few years, before returning to the world of drama at 11. 

In April 2005, he appeared in a sketch on Jimmy Kimmel Live!, in which he played a young Simon Cowell (via Screen Rant), and had guest roles on a number of shows include "The Suite Life of Zack and Cody" and "Standoff." He then had a small role in Nickelodeon's "Drake & Josh," which set in motion a chain of events that would lead him to star in "iCarly," the show that would propel him into the public eye.