Chris Applebaum

One of the biggest pop stars in the world, Britney Spears released this collection of 20 music videos to coincide with the unveiling of her greatest-hits album of the same name. Among the songs on Britney Spears: Greatest Hits -- My Prerogative are "I'm Not a Girl, Not Yet a Woman," "Don't Let Me Be the Last to Know," "Oops!...I Did It Again," and "From the Bottom of My Broken Heart."

No, it's not a History Channel documentary about the Wright Brothers hosted by a famous songstress; this fascinating video features Hilary Duff's music video "Fly" and an exclusive behind-the-scenes look at the making of the video, with special never-before-seen footage. You'll be flying high when you see exactly what makes this singer-actress so talented … in both disciplines. (Hint: It's star quality!)