Justin Bieber has responded to Sharon Osbourne's recent comments that his career "won't stand the test of time".
The former X Factor judge believed that Justin's worldwide fame will end just as quick as it started because his young fans are getting older and will grow out of listening to his music.
"But his problem [is] he's a little guy. His fans are growing up, they're 18, 19 year-olds now," Sharon said last week at the National Radio Conference in Australia last week.
"I just don't think, from my gut, maybe my gut's wrong 'cos it's not 100%, but I don't think he's going to stand the test of time." Justin has now responded to Sharon's remarks on Twitter, writing: "Doubt me…I like it."
"Not worried sharon...," he added.
Sharon isn't the only one to cast predictions on the longevity of others' careers - Ne-Yo controversially said he didn't believe Lady Gaga will last in the industry.
Do you agree with Sharon?
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Justin Bieber greets his fans outside the Langham Hotel in London today (Sept 12) (Photo credit: Ian Lawrence / Splash News)