From Seattle Grace to a real hospital, singer Natalie Cole experienced quite the guest starring role on our favorite show. The 55-year-old told E! that she broke her arm during filming, prompting staffers to scramble to her aid and call 911.

Cole was treated and released, subsequently returning to the Los Angeles set to finish filming her scenes.

Grey's Anatomy producers are keeping quiet about the nature of this guest-starring role, but here are some theories:

• She's the wife on whom Dr. Webber cheated with Ellis Grey
• She's a patient Alex falls for
• She's signing the national anthem before this season concludes with a Meredith vs. Addison steel cage match

Tune in Sunday nights at 10 p.m. on ABC and see!