Isabella, 21, is said to have completed a course at the Vidal Sassoon Academy and is now working at their prestigious London salon, reported Contactmusic.
The hair stylist reportedly decided to follow a different path to her famous parents by signing up the 30 week course, which costs 15,000 pounds.
"Isabella has been getting stuck in at work and doesn't make a fuss about who her parents are. Some of her workmates don't even realise," a source said.
Isabella opted to stay with Cruise, 52, following his divorce from Kidman, 47, in 2001 and alongside her father became interested in the Scientology religion.