Who knew writing songs about ex-boyfriends could be so valuable?

Taylor Swift is featured on E! Online’s new “Rich Kids Under 30” list with a net worth of – get this! – $150 million.

The site notes endorsement deals with Target, Sony, Walmart and CoverGirl as a few of the money-making machines in Taylor’s world.

Taylor ranked second of the list of rich kids, bested only by fashionistas Mary Kate and Ashley Olsen, who are reportedly worth a whopping $300 million.

Miley Cyrus tied Taylor with a net worth of $150 million, while Justin Bieber ($130 million) and Daniel Radcliff ($86 million) rounded out the Top 5.

Link up to the full list, which also features One Direction, Zac Efron and more, HERE.