Rihanna knows she's not actually the only girl in the world  and she doesn't seem to be panicking about it.

Rihanna is heading out on her world tour this week, and she apparently won't freak out if Chris Brown hooks up with ex Karrueche Tran while she's away, according to Hollywood Life.

“She’s not tripping on [Karrueche] like that no more. It’s cool,” says a source.“Her thinking is that if he f**ks up and slips, that’s on his conscience.” How very zen of Rihanna.

However, it sounds like Chris has made a point of saying that he'll be on his best behavior while Rihanna is away.

“[He] already made it clear to her that he don’t be f**king with her like that no more,” the source adds about Karrueche. “It’s just business where he and Karrueche are concerned." 

"Rihanna loves him, and she went down that road with [him] to make him happy and s**t, but [he's] growing up and wants her happy, so he's doing what it takes," the source continues.

We had previously known that Chris has been buying Rihanna flowers and making her feel like a princess prior to her leaving on the tour.

Will their relationship continue to shine bright like a diamond despite the distance? We shall see!

Source: Hollywood Life