Rihanna and Ciara at the 'World Music Awards 2007'. Monte Carlo, Monaco - 04.11.07

The pair are currently on tour in Europe, but were forced to cancel three dates in the U.K. earlier this week (begs10Dec07) after Rihanna fell ill with a cold.

And the 1, 2, Step singer has been making the most of her time off.

She says, "Rihanna's really under the weather. I've been trying to catch as much rest as possible so I don't get sick too, so we haven't really hung out yet."

Source: WENN