Rihanna, Chris Brown spark new collaboration rumours

Rihanna and Chris Brown have been spotted leaving a recording studio in West Hollywood separately, sparking rumours that the pair are collaborating on music together.

Brown's representative seemingly confirmed the news when they told E! News that the pair are "indeed currently working on another single".

It will be the fourth time that the 'Diamonds' singer and her former boyfriend have worked together on musical projects.

Brown recently teamed up with Rihanna for her Unapologetic track 'Nobody's Business'.

The pair previously collaborated on Rihanna's 'Birthday Cake' and Brown's 'Turn Up the Music'.

Rihanna is set to debut her first ever collection with River Island at London Fashion Week in February.

Watch the music video for Rihanna's 'Diamonds' below:

> Sunday chart predictions: 50 Cent, Justin Timberlake, more> Rihanna's River Island clothing line to launch at London Fashion Week> Rihanna peels off for behind-the-scenes video shoot