The 'Price Tag' hitmaker - who has an irregular heartbeat and suffered a stroke aged 18 - likened herself to the croaky 'Simpsons' character after suffering from throat problems, but she refused to cancel an interview with Ireland's Today FM radio station.
In a post on her Instagram page, she wrote: ''My voice has decided to be friends with the air con today and dry out to Marge Simpson vibes!
''So I'm in bright trousers and will do all I can to be entertaining with hardly no voice! Let's do this! Today FM official I'm live now!! *whispering*. (sic)''
But the 25-year-old star - who recently quit her judging position on talent show 'The Voice' - reassured her fans she knows exactly how to get her vocals back in tip top condition.
She said: ''To any of my contestants listening - yes, I lose my voice too, guys. You have to rest your voice, it's so hard.
''I know every trick of the trade [to treat a bad throat] - I know exactly why my voice is like this, I know exactly what I need to do to get it back. I'm just human.''
This Doctor won't be saying 'goodbye' in the same way as those who have left the series in recent years.