The 'Baby' hitmaker also had a hand in designing his new piece of jewellery which is based on animated 'Family Guy' talking baby Stewie Griffin - voiced by Seth McFarlane - and features 12 carats of rubies and diamonds.
Former Beverley Hills jeweller Jason Arasheben helped the 17-year-old singer with the necklace's creation, saying the 'One Time' performer "had a specific vision for how he wanted it to look".
In addition to his latest piece of jewellery, Justin ' who is dating 'Wizards of Waverly Place' actress Selena Gomez - recently revealed a new tattoo below his left armpit.
The inking ' which is believed to spell "Yeshua", the Hebrew spelling of Jesus - was pictured on the singer's body when he was holidaying in Hawaii with Selena.
It is believed to be the singer's second tattoo after he had a picture of a small bird inked onto his left hip shortly after turning 16 in March last year.
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