The challenge gets bigger as the Dominoes get smaller! Watch as 2,000 mini Dominoes (which are 80 times smaller than full size Dominoes) topple for a Guinness World Record.
The pop princess is saying goodbye to her 20s.
A look back on some of Hollywood's most memorable moments.
LISTEN: This week's top pop songs, according to the latest Billboard chart.
The "Shake It Off" singer fought with her record label to ditch her country girl image and become a pop star.