There's a new rumor going around that R&B star Rihanna is insulting her ex-boyfriend Drake by comparing him to one of her co-stars.

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On Saturday, Hollywood Life reported that Rihanna has begun her Monster tour with Eminem where the two will be performing with. The two sing together for the song "Monster" and "Love the way You Lie," and it turns out that Rihanna might think that Eminem is better than Drake.

A source has allegedly revealed that the "Diamonds" singer thinks Eminem is more mature and he "tells it like it is and how it is."

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"He's [Eminem] the realist," the source added. "She says it's been a while since she's been on stage with a real champion who gets it in a long time."

If this is true, then this could also be a directed reference towards the singer's ex-boyfriend Chris Brown as well.

Drake recently performed at the OVO Fest this week where rumor had it that he was referring to Rihanna as the devil. While he was singing one of his biggest hits "Days in the East," the number six showed up on the screen three different times, making 666. But something happened to show up in between each time the numbers were shown- it looked like a picture of Rihanna's face.

This caused a lot of speculation on what Drake was trying to do with this message, but he took to Twitter on Wednesday to explain, giving off the impression that there was a misunderstanding.

"My album title is VIEWS FROM THE 6. The 6 is Toronto. Rih is a great girl who I know is about to kill this tour with Eminem. It's all love!" he wrote.

Tags: Rihanna Drake Eminem