POTW: Rihanna, Lady Gaga, Adele, Soulja Boy

Rihanna trades her fire red locks for chocolate tresses to match her first fragrance, Reb'l Fleur, at the perfume launch at House of Fraser on Aug. 19 in London.

<p>See the week's best pics.</p>

Rihanna gets rid of her fiery locks, Lady Gaga goes Greaser and fans witness a deadly stage collapse. It all happened this week, and we've got the pics to prove it.

News of the Week: Billboard's 5 Most Popular Stories

1. 20 Dynamic Hip-Hop Duos

2. MTV Video Music Awards Most Outrageous Outfits

3. Katy Perry Makes Hot 100 History: Ties Michael Jackson's Record

4. Poll: Best MTV VMA Performance Ever?

5. Katy Perry's Most Outrageous Outfits