Rihanna has seemingly ditched her blonde hair in favour of a darker approach.

The global superstar on Saturday (March 31) had uploaded a number of photos to her Twitter account of herself in Japan, resplendent with her blonde hair.

However, the next day - April 1 - she showed off a collage of pictures showcasing what looks like a new hair dark colour.

As previously reported, the busy Rihanna recently announced that she is set to head out on a world tour in 2013.

The news comes as Rihanna also confirmed that she is working on new ideas for her next album and is "eager" to get on with it.