Nicole Scherzinger 'fuming with ex'

Nicole Scherzinger is apparently "fuming" about Lewis Hamilton partying with Rihanna.

The former Pussycat Doll has been dating the Formula One star on and off since 2008, but they ended their relationship earlier this month.

Not long after, Lewis was spotted at Jimmy'z Monte Carlo nightclub in Monaco, where he raised eyebrows by hanging out with Barbadian pop princess Rihanna.

Nicole is reportedly not pleased with her ex-boyfriend's behaviour.

"The break-up is still raw and Nicole is fuming," a source confided in British magazine Star.

"Both Nic and Lewis have a close bond and the last thing she wanted was to see her ex with one of the world's most sought-after women."

Rihanna has topped several 'world's sexiest' polls and is currently believed to be single after splitting from on/off boyfriend Chris Brown earlier this year.

Nicole has also been trying to keep herself busy since the split and is currently working as a judge on the UK edition of The X Factor.

Recently she was spotted hitting London for a night out, but rather than getting back at Lewis by taking a male companion, she held hands with singer Miley Cyrus.

RadarOnline spoke to the DJ playing at the Monaco club the night Lewis and Rihanna visited.

"Rihanna requested that I play only hip-hop, and she and Lewis were drinking, dancing and having fun," he claimed.