American R&B singer-songwriter, record producer and actress Beyonce Knowles has been named by Forbes Magazine as the richest star under 30 with an estimated $80 million (55 million pound) bank balance.

Pop superstar Justin Timberlake, 27, came second with an earnings of $43 million (30 million pound) followed closely by US basketball player Kobe Bryant with $39 million (26.8 million pound).

Others to have made it to the top 10 in sequential order are LeBron James, Roger Federer, Keira Knightley, Maria Sharapova, Daniel Radcliffe, Miley Cyrus and Mary-Kate and Ashley Olsen.