Ashton Kutcher -- Achtung! Rich, Single Guy on the Loose in Berlin

Ashton Kutcher left a Berlin party last night with not one, not two ... but THREE chicks! Aahh, the single life.

Ashton was spotted kicking it with a mystery brunette inside a house party -- he had a smoke while they shared a glass of wine. He eventually left with her and two other women in a chauffeur driven BMW. Later, he and the brunette walked into a swanky Berlin apartment ... alone.