And as he frolicked on the beach in Maui with his young starlet girlfriend, Disney star Selena Gomez, 18, with her arms and legs wrapped around him, he certainly seemed older than his years.
The baby faced singer has been enjoying a romantic vacation with Selena, staying in a $10,000 a night suite at the Four Seasons Hotel - apparently without the supervision of their parents, or minders.
Young love: Justin Bieber embraces his girlfriend Selena Gomez in the ocean during their romantic break in Maui this week
Do you think anyone's watching? The couple seemed oblivious to other beach-goers
Sweeping Selena, 18, up in his arms, as she clung to his waist, he embraced her in full view of other beach-goers.
The pair then enjoyed a splashing contest, before showing their adventurous sides with a jetski ride and flew above the sea on a parasail.
Gissa kiss: Bieber leans into his Disney belle as they smooch in the sea
If I fall, will you catch me? Selena throws her arms out as she leans back as Bieber goes to grab her
Justin took charge of the jetski, powering through the waves as his girlfriend clung to his waist at one point tenderly placing her hands on his shoulders.
The pairing of two such teen stars is a publicist's dream. But while they are reportedly being supervised by their parents - they made sure to stay out of shot so as not to spoil the stunning pictures.
You're so funny! Selena throws her head back as she hugs Bieber and they lark about in the water
Let's go dry off: Bieber and Selena head back to the sand after their romantic frolic in the sea
While on the parasail - which had a rather fitting smiley face design on it - they took their relationship to dizzying new heights.
The couple are reportedly staying in an exclusive $10,000-a-night suite at the Four Seasons resort.
According to website Hollywood Life: 'The pair are in the Maile Suite, a luxury palace on the seventh floor of the resort.
In the driving seat: Justin takes charge on the jetski as the couple show their adventurous side
Making a splash: The pop superstar grimaces as he powers through the waves with his girlfriend Selena Gomez in tow
'The signature of the three bedroom suite is floor-to-ceiling windows which allow a magnificent ocean view.'
The suite, which they're sharing with their parents, has three bedrooms and five beds.
Smiles high: The couple are lifted high above the sea during a parasail ride - their parachute reflecting the happy mood of their holiday
Love boat: Justin and Selena, centre, head out on the ocean waves as they prepare to embark on their exciting parasail ride
Special features include a 50-inch flat-screen television with DVD player, a stereo with CD player and a music and movie library, a marble master bathroom with a deep soaking tub with whirlpool and a separate eucalyptus rain shower.
The couple can also enjoy romantic meals in the elegant dining room which features an adjoining butler's kitchen. They also have their own 24-hour personal concierge.
Whether the youngsters are allowed to share a bed together is unknown, although with Justin being a minor it's doubtful their parents would allow such a thing.
However, Justin and Selena's time on the beach appears to be completely unsupervised.
At no point during their romantic day together did there seem to be any elders present - aside from their parasail ride of course.
Gentleman: Justin gives his girlfriend a helping hand on to the boat as they get ready to sail out to see
Romantic trip: The happy couple take a look at scuba diving aids as they enjoy the sun in Maui, Hawaii
The teens apparently spent most of their time together without minders or their parents.
But the holiday isn't all romance for the youngsters - both are accompanied by their parents, who were elsewhere as they enjoyed their trip to the beach.
As Justin cavorted with Selena, he revealed his two tattoos.
Holiday time: Justin and Selena splash each other in the water, as he encourages her to come in
Bikini girl: Disney star Selena, 18, wore a pink two-piece for her trip to the beach
One, on his stomach, is the outline of the seagull from Jonathan Livingston Seagull, a tattoo he had done to match his father and uncle and mark his 16th birthday.
The other, on his torso, is in Hebrew.
As Bieber is aged under 18 he needed parental permission to get his tattoos.
Braving the ocean: Justin shows off his Hebrew tattoo as he and Selena take a dip in Maui
Too young? Justin has two tiny tattoos at the tender age of 16, one on his chest and one on his torso
He and Selena only went completely public with their romance at the Billboard Music Awards show in Las Vegas last weekend - sharing kisses and hugs in the audience.
The young lovebirds smooched as Justin dominated the star-studded ceremony last weekend.
Selena appeared to be making a good impression on her boyfriend's family, as she sat with her arm around Justin's mother, Pattie Mallette.
Home time: The teens are on holiday with their parents
She was, however, notably absent from her boyfriend's two acceptance speeches.
Justin, who was wearing a gold tuxedo jacket, grinned as he took home six awards
The pint-size pop star shared a slightly awkward hug with Selena as his name was read out as the winner of digital artist of the year.
Holding hands: The pair later went for a stroll on the beach, with Selena covering up in a crocheted top
Daring: The adventurous couple went jet skiing and para-sailing
He thanked his family, his fans, manager Scooter Braun and Usher - who signed the youngster to his record label and turned him into a superstar.
'Basically everyone who helped me get out of my hometown and live my dream,' he said.
The young couple made up for their awkward moment as the former YouTube sensation was named the top new artist of the year.
Justin leaned in for a passionate kiss with his girlfriend and Selena beamed with delight as she watched her boyfriend on stage.
Shirtless: The teen singer wore a pair of bath shorts teamed with flip flops while Selena donned a pink bikini top and Daisy Dukes
The Canadian pop sensation thanked 'God' as he picked up his second award and paid tribute to his proud mother.
'Mom - you've been amazing. You've been travelling with me, putting up with all my crap,' he said.
Justin also won awards for top pop album, top streaming artist, top song and top social media artist.
Fully public: Justin and Selena shared kisses in the audience as he picked up six gongs at the awards ceremony