New dashcam footage has just surfaced, showing Britney Spears being cuffed by police. The dramatic video confirms the pop star failed a sobriety test, leading to her arrest. This TMZ exclusive is reigniting the conversation around Spears' ongoing personal challenges. Fans are reeling, as the Princess of Pop is once again under intense public scrutiny following this latest incident. We'll have more on the legal and public relations fallout throughout the hour.