Selena Gomez is proving once again that she was always a cool kid, sharing a throwback video of her singing along to the Britney Spears track "Don't Go Knockin' On My Door”.
PEOPLE in 10: The News That Defined the Week PLUS Derek Hough Joins Us
Kate Middleton and Prince William return to where they first fell in love, Ryan Sutter reveals he has Lyme disease, Selena Gomez..
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