Cameron Diaz is set to get busy in the bedroom with Jason Segel while the cameras roll.

The sexy star has reportedly joined the cast of the upcoming Sex Tape, a comedy about a married couple who panic after losing a very personal video.

Reese Witherspoon was originally set to take the role, but now Diaz is set to reunite with her Bad Teacher co-star Segel on the project.

The screenplay for the film was written by Kate Angelo, who also wrote 2010's "The Back-Up Plan," which starred Jennifer Lopez.