It's Cher Lloyd!
The X Factor contestant is going to be guest-starring on an episode of the Nickleodeon show. Her episode is going to come out sometime in the spring.
In Cher's episode, James and Katie make up a story that she's working on a song and music video with Cher Lloyd!
Wambie girls, will you be tuning in to watch Cher on Big Time Rush?
Source: Beautiful Ballad