Eminem Birthday! 'Shady XV' Rapper Celebrates 42 Years, Twitter Fans Honor 'Rap God,' Will Rihanna Share 'Happy B-Day' Wishes?

Guess Eminem's age.

The Shady XV rapper turns 42-years-old today (Friday, October 17).

Crazy, right?

Several Twitter fans continue wishing the legendary Detroit emcee a very happy birthday:

@hasnaatm1: "42 years ago today a legend was born, Happy Birthday Eminem! #HappyBirthdayEminem."

@NateKane247: "Happy Birthday to the Greatest Brother @Eminem in the World. Love u Big Bro #HappyBirthdayEminem."

@friday_24: "Happy birthday Rap God, U are the best *-* #HappyBirthdayEminem."

@EminemQuotes1: "Happy Birthday to the greatest rapper of all time, Eminem! #HappyBirthdayEminem."

@LifeofLexi16: "#happybirthdayeminem I grew up listening to him and he has made a smile appear on my face over and over again and still does."

@Eminemoholic: "October 17 a legend was born, thank you for being part of my life #HappyBirthdayEminem."

@ilovesmarshall: "Eminem is living his dream and in the process he is making our dreams come true. There's only one Rap God. #HappyBirthdayEminem."

@ThaShadyGrizzly: "That's some reasons why I'm hella proud of being his fan 'till today! #HappyBirthdayEminem."

@cpm_nm: "Keep calm 'cause it's god's birthday! #HappyBirthdayEminem."

@GilbertMendez94: "Happy Birthday to the best and the greatest white rapper and hip-hop ever @Eminem. #HappyBirthdayEminem."

Despite "romance" rumors, Shady's "The Monster" tour-mate Rihanna has yet to give the MMLP2 emcee a b-day shout-out. Wonder how the "Rap God" is celebrating today - perhaps with his teenage daughter Hailie Jade Scott Mathers?

Em's highly-anticipated upcoming album Shady XV hits stores November 24, 2014.

Happy birthday, Eminem!