At just 27, Itsines has an app, a book, a range of workout merchandise and over 10.3m engaged Instagram followers.
But how much is she worth? Last year, Forbes released its first ever 'Top Influencers' list, which showcases those who have the biggest social media followings in their sector, and, naturally, who make serious cash off their posts.
The BBG founder came in first place, beating New York-based fitness trainer Jennifer Selter and fellow Australian Emily Skye, with the report stating she made $17m last year off her 'Sweat with Kayla' app alone. Plus with her ever-growing Insta' fame, Kayla can make up to $150,000 per Instagram post.
Coming in at 5th on the list with her fiance, Tobi Pearce, in 6th, the list reveals the couple has a joint net worth of $486 million, making them the wealthiest self-made 20-somethings in Australia. The list notes that the fitness duo generated most of their earnings from their fitness app, Sweat.
In comparison, Miranda Kerr, one of the world's top supermodels and founder of Kora Organics, is worth $52 million.
Talk about #fitspo and #girlboss goals.