Bungie first hinted at the existence of the Easter Egg in 2012 when the company's Jon Cable confirmed he found it in the game's code, noting it only rears its head on a specific day.
Programmer Adrian Perez later revealed the Easter Egg was a loading screen dedicated to his wife as a birthday gift.
Now the process for accessing the Easter Egg has finally been worked out, according to users at TeamBeyond. According to the website, if you press down on both thumbsticks during the loading screen on Dec. 25, you will be shown a wider view of the Halo ring. Written on the ring's surface is "Happy Birthday Lauren!"
You can check it out in the video below.