The Silver Linings Playbook actress - who recently revealed she was suffering from pneumonia - was more concerned by her unbalanced chest than any potential lung problems she may be experiencing after undergoing an X-ray during a doctor's appointment.
She told TV talk show host Jimmy Kimmel: "I just went to the doctor today, I got a chest X-ray of my lungs and discovered that my breasts are uneven.
"I was like standing there with these doctors and they're like looking at my lungs and I just couldn't - it felt like an elephant in the room - and I was like, 'Are my breasts uneven?' And they were just kind of, like, stifled and uncomfortable, obviously. So I kept thinking, 'Well, I'm gonna dig myself out of this hole by bringing it up again.'
"So he was like, 'All right, our radiologist will get back to you about your lungs.' And I was like, 'And my breasts?' "
However, the 22-year-old beauty insists she massively concerned about her boobs, but joked she hopes the X-rays are never made public.
She added: "I hope I'm never seen in that light!"