Leona Lewis is planning to imitate Lady Gaga by giving her pop career a radical overhaul, it has been revealed.

The former ‘X Factor' winner looks set to shed her good girl image and unveil "big changes" ahead of upcoming live dates and new material.

"Leona's ready to evolve her look and music," explained an insider of her imminent relaunch.

"She wants her next album to be totally unexpected and different, like Rihanna's and Gaga's. They're around her age and make the kind of exciting impact she wants to make.

"Leona's latest album hasn't done as well as she hoped and she feels she has to step it all up," said the insider.

Earlier this year, the singer got a tattoo along her spine and was seen wearing a risqué outfit at Perez Hilton's birthday party in LA last month