19 songs you forgot were No. 1 hits in the 2000s

Janet Jackson, Sisqo, Britney Spears, P. Diddy.Peter Kramer/ASSOCIATED PRESS; Frank Micelotta Archive/Getty Images; Reuter’s Photographer/REUTERS; Powers Imagery/InvisionAP; Arif Qazi/Insider

• The 2000s gave us some of the most iconic No. 1 songs ever.
• Some, however, haven't stood the test of time.

The 2000s gave us some of the most iconic Billboard Hot 100 No. 1 songs ever.

50 Cent announced himself to the world with his birthday anthem "In Da Club," future husband and wife Jay-Z and Beyoncé teamed up for the immortal "Crazy In Love," and Soulja Boy had us all posing like superman on the dance floor with "Crank That."

Not every No. 1 from the decade has stood the test of time like the aforementioned, however.

Here are 19 noughties chart toppers you may have forgotten about.