What can you give a person on his birthday, who has everything in the world, including Selena Gomez? Give him the gift of a world record. Yes, that's what Bieber's fans on Twitter is trying to set by sending out the most social media messages in 24 hours, wishing Bieber a happy 18th birthday.

Justin Bieber is officially an adult now - the teen pop sensation turned 18 on Thursday and surprised his fans with a special appearance on The Ellen DeGeneres Show.

However, Bieber himself was caught by surprise when his longtime manager, Scooter Braun, who also appeared in the show, presented the singer with an ultra-sleek luxury hybrid sedan, the $100k Fisker Karma.

The surprise gift left Bieber, who already owns a Batman-themed customized Cadillac and a Ferrari, genuinely speechless and shocked.

The coveted car, which is owned by celebrities like Leonard DiCaprio and Al Gore, features two driving modes - the Stealth Mode for optimal relaxed and efficient electric driving, and the Sport Mode to access the vehicle's full power. The hybrid car can do an economical 100 miles per gallon and boasts of solar paneled roof (which means the car's battery can recharge itself while it is on the move).

You never get anything for yourself so Usher and I wanted to do this for you Braun told the singer, who called the gift crazy and amazing.

DeGeneres gifted Beiber with a windshield sunshade featuring a love heart within which her and Bieber's faces featured, as well as a bobblehead, which bore her likeness, for his dashboard.

Bieber had his feet firmly on the ground and said he wanted to share his Birthday joy with the underprivileged. So he twitted, I want to use my bday to help others. if u want please donate $18 to @charitywater on my 18th bday!

The pop star also announced that the lead single called Boyfriend from the new album Believe will be released on March 26.

My first single is going to be amazing — everyone's going to love it, Bieber said.

The song, it's basically I'm talking to this girl, [saying] if I was your boyfriend, I would never let you go, the singer added. The track was cowritten with singer-songwriter Mike Posner.

Meanwhile, Bieber's fans are trying to set a world record by sending out the most social media messages in 24 hours. These are some of the birthday greetings left by Bieber's fans on Twitter:

Happy Birthday to @JustinBieber! RT Bieber Fans Eye Social Media World Record for His 18th Birthday http://on.mash.to/w4L7BF - Samantha Murphy ‏ @MurphySamanthaJ

Today is Justin Bieber's 18th Birthday. I guess that means he's no longer just a baby, baby, baby, oooooh. - Korey ‏ @koreykuhl

Happy National Bieber Day, still Can't Believe that Justin is OFFICIALLY 18. Love You. - Amit Ben Moshe ? ? ‏ @Amit7748

I'm so proud of how far Justin has come, Justin is OFFICIALLY 18. omg the river of tears have begun. Happy National Bieber Day. ♥ - Drummer Girl ? ‏ @iKidrauhlRocks

Happy National Bieber Day. Party hard Justin, cause you only turn 18 once. So, live your life and have fun. - Bang Bang. ‏ @WeThinkComedy

Our Kidrauhl Is 18, no matter how old he gets, in our hearts he'll be forever that 15 years old boy singing 'aye aye aye' in his grey hoodie - JB/Wright/JLS/Andre♥ ‏ @JBieberLoverMel

Our Kidrauhl is 18. <3 I'm so proud of him. Oh my god. - Justin Bieber Fan. ‏ @LaSonrisaBieber

i cant believe that Our Kidrauhl is 18. It feels like yesterday when I was watching his very first youtube video for the first time. - Mrs. Weezy ‏ @iWetBiebersBed

Justin is OFFICIALLY 18 He's 18 and now Part of The Illuminati - The Illuminati ‏ @ThelIluminati

He's 18. He's now a man. He's never going to change who he is. He's always gonna be kidrauhl. Aint that right @justinbieber?♥xxxxxx - l a u r e n.? ‏ @iBiebersAbs

Also don't forget to check out $100K shiny set of wheels gifted to Bieber in this video below:

Also check out Bieber singing a snippet of Miss You by Chris Brown in the video. The teen sensation has indeed come a long way.