Luke Hemmings is the baby of 5 Seconds of Summer and now he's officially in his last year as a teenager.

How Did 5 Seconds of Summer Prank Their Fans On Twitter About Their New Single?

The 5SOS singer and guitarist is celebrating his birthday all while being totally hyped for his band's new single to drop tomorrow, July 17.

Anyway, being the youngest in the band definitely has its advantages probably, but it seems like it totally has its disadvantages too.

Ashton Irwin Had His 'First Legal Lager' In America Since Turning 21!

Hemmings' bandmates have celebrated their buddy on social media of course, but the celebrations at least in one instance have been rather embarrassing.

Ashton Irwin poured out some bromantic love as he gushed, "Happiest of birthdays [to] my dude."

"I love you buddy, so much," the drummer added sealing it with a kiss (a big "X").

Michael Clifford took a different approach in celebrating young Hemmings. Embarrassment was the way to go after a properly kind birthday tweet in which he referred to Hemmings as "an awesome dude."

So the embarrassment comes with an Instagram video, which Clifford captioned, "Happy birthday Luke."

 Happy birthday Luke

A video posted by Michael Clifford (@michaelgclifford) on Jul 16, 2015 at 12:40pm PDT

 

In the video Hemmings is shaking his junk to be totally blunt about it. He also looks a bit younger. These guys are always joking around so it's kind of no surprise at least one of Hemmings' bandmates went in this direction in terms of sending birthday love. This makes us wonder what other videos are stored on these guys' phones and laptops!

Anyway, Calum Hood has been mum on social media in celebrating Hemmings' birthday, but we imagine they'll go out tonight for a bit of fun since they're in Las Vegas. The North American leg of their tour kicks off tomorrow there!

Tags: 5 seconds of summer