A morning mix of entertainment headlines...

Robin Roberts is preparing for a bone marrow transplant. (Reuters)

Jenna Dewan — the wife of Channing Tatum and an actress in her own right — will join the cast of “American Horror Story.” She has been cast as the lover of a character played by Adam Levine. (Entertainment Weekly)

Why is Janet Jackson involved in the whole ugly Jackson family battle over Michael Jackson’s estate when she clearly doesn’t need the money? According to Fox411, it’s because she is devoted to brother Randy Jackson, and also because she doesn’t want her siblings to start hitting her up for money. (Fox411)

McSteamy (Eric Dane) is saying McBye-Bye to “Grey’s Anatomy.” (People)

Lady Gaga will make her film debut in “Machete Kills,” Robert Rodriguez’s sequel to “Machete.” And she already has her own poster. (Deadline)

The parents of a stuntman killed on the set of “The Expendables 2” are suing Millennium Films and the movie’s stunt coordinator for $25,000. The stuntman, Kun Liu, died last October due to wounds suffered as the result of an explosion. (CBS News)

Apparently Dan Aykroyd is available to perform weddings. And he recently officiated the nuptials of his old pal Chevy Chase’s daughter. (Vulture)

A survey suggests that 20 to 25 percent of potential moviegoers may be too afraid to go to the movies this weekend due to last Friday’s “Dark Knight Risesshooting in Aurora. It’s unclear how many people research firm NRG surveyed to determine that percentage. (Hollywood Reporter)