Bieber, 19, hit headlines earlier this year with antics including peeing in a mop bucket, partying in nightclubs despite being underage in the US, arriving on stage over two hours late for shows, and smuggling his pet monkey into Germany, where he abandoned it.
And now the 'Boyfriend' hitmaker has advised his friend, Cyrus to have fun following the end of her engagement and they have been in almost constant contact in recent weeks, reported Contactmusic.
"Justin reached out to say that she needs to loosen up and have fun. They're bonding over their career backlashes and talking almost every night," a source said.
"They're even considering an outrageous duet," the source added.
Following her split from Hemsworth, Cyrus is now dating producer Mike WiLL Made It. While the Australian hunk has been romantically linked with Mexican model Eiza Gonzalez.