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Five time Olympic Champion Missy Franklin admits as a seventeen year old, receiving a tweet from singer Justin Bieber was the highlight of her London 2012 games.

Franklin won five Olympic golds, but has since retired at the age of 23!

She reveals how she struggled with depression as injuries halted her career.

Photo: US swimmer Missy Franklin poses on the podium with the gold medal after winning the women's 100m backstroke swimming event at the London 2012 Olympic Games (Getty Images)