Full moon: Justin Bieber bares booty in Cabo

WHAT a cheeky devil. Justin Bieber mooned photographers as he lounged poolside with his rumoured girlfriend, Sofia Richie.

Bieber and Richie soaked up the sun in Cabo.

WHAT a cheeky little devil.

Justin Bieber mooned photographers as he lounged poolside in Cabo San Lucas with his rumoured girlfriend, Sofia Richie.

The Sorry singer was celebrating Richie’s recent 18th birthday when he dropped his boardies and flashed his booty.

The 22-year-old didn’t let the paps ruin his day and the two young stars later engaged in a steamy PDA.