If there was a day that everyone should be born, it's on this day, Dec.18, 2017.

Some of the most famous Hollywood stars are celebrating their birthday on this day. These include celebrities such as Christina Aguilera, DMX, Brad Pitt, Sia and Steven Spielberg.

Twitter Reacts

Fans have sent their Happy Birthday greetings to all of these celebrities. See their well-wishes below.

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Celebrities, Christina Aguilera, Brad Pitt, Steven Spielberg, DMX, Sia, Celebrity Birthdays