Sexy Stamp: Calvin Harris
Second place on the list was 'Harry Potter' star Daniel Radcliffe with an estimated fortune of £63.5 million, while his former wizarding co-star Robert Pattinson took third place with estimated earnings of £51.4 million.
And it seems 'Horns' actor Daniel, 25, wasn't happy with his ranking as he felt he should have been given the top spot.
He joked to heat: "There's five of them! That doesn't count! Not that I care but I am definitely first!"
Also featured on the list - which is based on estimated earnings from movie deals, record sales and other endorsements - were actress Keira Knightley, 29, in fourth place with £39.9 million and singer Adele, 26, who took fifth spot with a fortune of £36.25 million.
The top 10 also featured two more 'Harry Potter' stars, 24-year-old Emma Watson, who was ranked sixth with a fortune of £31.66 million and eighth placed Rupert Grint with £27.33 million.
Calvin Harris, 30, took seventh spot with £28.99 million, and the top 10 was completed by singers Leona Lewis with £15.51 million and Arctic Monkeys frontman Alex Turner, 28, with £13.56 million.
Top 10 richest British stars under 30:
1. One Direction (£77.52m)
2. Daniel Radcliffe (£63.56m)
3. Robert Pattinson (£51.41m)
4. Keira Knightley (£39.95m)
5. Adele (£36.25m)
6. Emma Watson (£31.65m)
7. Calvin Harris (£28.99m)
8. Rupert Grint (£27.33m)
9. Leona Lewis (£15.50m)
10. Alex Turner (£13.56m)
