Britney Spears returns to Instagram and declares she's 'not having a breakdown'

Britney Spears has returned to Instagram and declared she is "not having a breakdown".

The 41-year-old pop star has revived her page on the social media platform a week after taking it down - which prompted worried fans to call in authorities to perform a welfare check on her - and she's now shared a lengthy post insisting she has "never felt better".

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