Pop star Justin Timberlake is allegedly considering marrying his actress girlfriend Jessica Biel.

A source close to the SexyBack singer claimed that he has been planning different wedding ideas and has decided that the West Indian island of Mustique would be the dream location.

The island is privately owned meaning no paparazzi would be able to take any wedding photography and the ceremony could be kept a personal affair.

"Justin is 27 and thinking about marriage and kids," an insider told the Sun. "For the first time in his life he is feeling settled and has definitely decided to pop the question to Jessica."

Timberlake, who recently duetted with Madonna, could be a prominent face in Ellen DeGeneres' forthcoming wedding albums.

The pop star said he would compose and perform a special song for the chat show host's civil partnership to actress Portia De Rossi, claiming it will be "amazing".