Next round's on Lady Gaga. The pop superstar is officially the most loaded person under the age of 30, according to a Forbes magazine poll. The 25-years old has raked in £55million over the last 12 months, placing her ahead of Justin Bieber, who generated £32million, in the survey of the highest-paid celebrities under 30. The duo head a top which includes tennis ace Roger Federer, who comes in fourth with £28million in earnings. His great rival Rafael Nadal is tenth on £19million. LeBron James, Taylor Swift, Katy Perry, Christiano Ronaldo and Beyonce also feature in the list of the wealthy young.