The 17-year-old pop singer went to the gay club Kremlin with girlfriend Selena Gomez after picking up two prizes at the MTV EMAs.
A source said to UK newspaper The Sun: 'Justin managed to shake off the thousands of fans who were following him around the city.
'He went to the official MTV party at the Europa hotel with his girlfriend Selena Gomez before being smuggled out in secret.
'The Beliebers were left waiting outside the front of the hotel hoping for a glimpse but he slipped through a side entrance used for kitchen deliveries and later left the same way.'