Actor Brad Pitt has reportedly bought a painting of singer Justin Bieber to gift to his son Pax, who is a fan of the musician.

Pitt got the portrait by street artist Bambi after her agent offered him the artwork.

"Pax loves Justin and so Brad thought this would be the perfect gift for him. Brad loves Bambi's unique style and this is his third purchase from her," dailystar.co.uk quoted a source as saying.

`When he found out she'd done a piece with Justin, he knew he'd have to get it for Pax. The Justin artwork is done on a panel of wood and he loves how unique it is," added the source.

The painting portrays the pop star alongside the words, "Rebel without a clue".