Gabrielle Union says America's Got Talent exit was the 'hardest part' of her career

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Gabrielle Union says her 'America's Got Talent' exit was the "hardest part" of her time in Hollywood.

The 47-year-old actress filed a complaint about "toxic" behaviour on the set of the NBC talent competition earlier this year, following her decision last year to quit the show after just one season on the judging panel because of the alleged racial bias and discrimination she faced.

And now, Gabrielle has admitted the situation was "so heartbreaking and so unnecessary" that she now views it as the most difficult part of her career to date.

When asked for her toughest career moment during an interview with USA Today, she said: "Probably the 'AGT' ... it all was so surprising and so heartbreaking and so frustrating and so unnecessary. That would be probably the hardest part."

The 'Being Mary Jane' star filed a discrimination complaint against NBC, Simon Cowell, FremantleMedia and Syco Entertainment in California's Department of Fair Employment and Housing in June this year.

However, the case has since been closed as she instead requested an immediate right to sue, which she was granted.

Her official complaint came after NBC previously conducted an independent investigation into Gabrielle's allegations, but she was unhappy with how it was handled.