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Justin's never been short of a few friends and has buddied up with everyone from Usher to The Wanted. To celebrate the 'Never Say Never' singer's 18th birthday, we take a look at some of Justin Bieber's best showbiz friendships.
Max, Jay, Nathan, Siva and Tom joined Justin for several dates on the South American leg of his world tour back in late 2011, and later reunited with the Canadian pop star to turn on the Christmas lights at both Westfield shopping centres in London. The Wanted and 'Baby' singer Justin have continued to support each other ever since, most recently with Justin congratulating the 'Glad You Came' singers on their US chart success.
Justin fulfilled many a teenage boy's dream when he got to take a picture with 'Love On Top' singer Beyonce at the 2010 Grammy Awards. The 'Baby' singer simply tweeted the word 'Wow' after getting to meet both Beyonce and her husband Jay-Z at the prestigious music event.
Fans shouldn't have to wait too long for Justin to team up with 'Domino' singer Jessie J. The singer has openly admitted she would love to collaborate with Justin after getting the chance to meet him at the UK premiere of his 3D film Never Say Never back in March 2011.
There can be no doubt that Justin's number one celebrity pal is Usher Raymond himself. The R&B singer was responsible for discovering the Canadian pop star, signing him to his first deal and has continued to guide his music career ever since. Usher even featured on a remix of Justin's hit single 'Somebody To Love'.
The 'Gold Digger' rapper posted a picture himself the Biebster working on a new project together in the recording studio this February. Justin told Capital last year that his collaboration with Kanye will feature on the 'Baby' singer's new album 'Believe' . Picture: Twitter
Justin's self-described "Big Bro", 'Lollipop' rapper Lil Wayne has also been working on a new collaboration with the 'Never Say Never' star. The singer uploaded this picture of the two enjoying some downtime in between working on a track for Justin's third album 'Believe'.
Fellow Canadians Justin Bieber and Drake are set to team up on the latter's new album 'Believe'. Drake previously described Justin as "one of the most talented musicians" he knows and admitted he couldn't wait to record some new music with the pop singer.
Back at the start of 2011 Justin released 'Never Say Never' as the soundtrack single for new film The Karate Kid and had the 12 year-old lead actor Jayden Smith contribute vocals to the track. Jayden, the son of I Am Legend star Will Smith, features in the 'Never Say Never' music video and also joined Justin on stage at the 2011 Grammys to perform the song live.
Justin's Island label mate Ludacris also holds the distinction of being the first artist the 'Somebody To Love' singer collaborated with. The two released Justin's 'My World 2.0' lead single 'Baby' at the start of 2010, which has gone on to become one of the pop star's most successful releases.
Justin's showbiz pals' list also boasts 'Beautiful Girls' singer Sean Kingston, who recorded a duet with Justin called 'Eenie Meenie'. The team-up track featured on Sean's third album 'Back 2 Life' as well on the 'Baby' singer's first album 'My World 2.0'.
In June 2011 Chris Brown released 'Next 2 You' as the latest single from his fourth album 'F.A.M.E.'. The 'Beautiful People' singer tasked Justin to provide guest vocals and the then 17 year-old pop star also featured in the track's music video.
Seen here posing with both Far East Movement and Snoop Dogg at the 2011 Billboard Music Awards, Justin recently teamed up with the former on their brand new single 'Live Your Live'.
After releasing his festive album 'Under The Mistletoe' back in November 2011, Justin then teamed up with Mariah Carey to rerecord her ubiquitous Christmas hit 'All I Want For Christmas Is You' and the two also shot a predictably festive-themed music video together to promote the release.
Justin and Black Eyed Peas star will.i.am just couldn't keep quiet about their secret collaboration after tweeting each other about it on Twitter back in January. 'OMG' rapper will.i.am later confirmed the two had recorded a track for his new album '#willpower' and said he "couldn't stop listening to it".
Justin got the opportunity to add a living musical legend to his already extensive contacts book when the two teamed up to singe 'The Christmas Song (Chestnuts Roasting On An Open Fire)' during The X Factor USA back in December. After the performance Stevie told host Steve Jones he thinks Justin is "incredible" and even said he reminds him of himself as a young man.
Justin got the chance to pal up with 'We Found Love' star Rihanna last year when he managed to score courtside seats with RiRi for the NBA All-Star basketball game.
It seems no one is too big for Justin as the Canadian pop star has even had the opportunity to sing on stage with the US President! Justin joined Barack Obama and his family for the Christmas in Washington event in 2011 for a rendition of 'Hark! The Herald Angels Sing'.
After months of speculation Justin and actress Selena Gomez stepped out together at the Vanity Fair Oscar Party in 2011, seemingly confirming they are in a romantic relationship. Since then the two have regularly been spotted out on several dates and public appearances together.
Justin proved he could even be part of the Party Rock Crew when he donned a pair of yellow tiger print trousers and joined them on stage at the American Music Awards 2011 for a performance of their hit single 'Party Rock Anthem'.
A fresh-faced Justin poses with 'California Dreams' star Katy Perry at showbiz blogger Perez Hilton's birthday party in LA back in 2010.