Last night Mel Gibson made a surprise appearance at Premiere nightclub for his son Milo's 21st birthday, and the actor stayed silent when photographers asked if he threatened to kill ex-girfriend Oksana Grigorieva.

Mel's ex-wife Robyn was there as well, along with son Christian, Tommy (who is just 11 years old!) and several others close to the family. What shocked us the most though was Mel leaving in a Smart Car...