1.

Beyoncé "The single ladies (put a ring on her)" …

2

… and Lady Gaga's "Just Dance" were the # 1 songs in the country … and also the # 1 songs that made everyone on the dance floor.

3

Lady Gaga also rocked her iconic hair.

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4

The Kings of Leon dominated alternative radio with their hit "Sex on Fire".

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… and she also played on SNL for the first time (in case you forgot it, hosted by Neil Patrick Harris).

7.

Chris Pratt and Anna Faris announced that they were engaged.

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8

Fergie and Josh Duhamel got married.

9

Prince Harry and Chelsy Davy separated after five years of attendance.

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ten.

Joaquin Phoenix said that he was ceasing to play for a career in rap.

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12

Faye Dunaway and Hilary Duff began their quarrel after Faye reportedly said, "Could not they at least play a real actress?" hearing Hilary play "Bonnie" in a remake of Bonnie & Clyde (a role that Faye immortalized).

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13

Jessica Simpson had the Internet in all its states after wearing this famous jeans:

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15

The Oscar nominations were announced and, as expected, Heath Ledger received a posthumous nomination for Best Supporting Actor for his role as Joker in The Dark Knight.

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16

Katy Perry said that she was vowing celibacy but took it back the next day.

17

The 66th Golden Globes ceremony was aired and some of the big winners were Slumdog Millionaire for Best Dramatic Film …

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18

… Mad Men's Best TV Series – Drama …

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… and 30 Rock for Best TV Series – Musical or Comedy (Tina Fey and Alec Baldwin also won the Globes Award for Best Performance in a television series – Musical or Comedy for their performances in the series).

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20

Kara DioGuardi made her debut as a judge in the eighth season of American Idol.

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21

Paul Blart: Mall Cop and Taken were among the films released this month.

Columbia Pictures, 20th Century Fox

23

Finally, Barack Obama was sworn in the 44th presidency of the United States of America.

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