American Top 40 Turns 40 - Remembering 2007

The iPhone debuts. The seventh and final installment of the Harry Potter series is published. And the first U.S. mortgage lender to file bankruptcy begins a financial crisis.

FUN FACT: "Umbrella" was originally written for Britney Spears, but she never heard the song – her label rejected it.

Top 10 AT40 Hits of 2007

1. Big Girls Don't Cry (Personal) - Fergie

2. Say It Right - Nelly Furtado

3. The Sweet Escape - Gwen Stefani ft. Akon

4. U+Ur Hand - Pink

5. What Goes Around ... Comes Around - Justin Timberlake

6. It's Not Over - Daughtry

7. Give It To Me - Timbaland ft. Nelly Furtado & Justin Timberlake

8. Glamorous - Fergie ft Ludacris

9. Cupid's Chokehold - Gyn Class Heroes ft. Patrick Stump

10. Umbrella - Rihanna ft. Jay-Z