Leonardo DiCaprio, who has a gorgeous girlfriend Bar Refaeli, apparently went on a major flirting spree at the Maxim Hot 100 party.
His behaviour caused one friend to remark: "Don't you have a girlfriend?"
The actor was surrounded by beauties at Wednesday night's bash at Paramount Studios.
Refaeli was, however, nowhere in sight.
"All the girls were making a beeline for him, and while he was friendly, he went home alone," The New York Post quoted an onlooker as saying.
Another star that attended the bash was Jamie Foxx – who was seen grinding a hot brunette on the dance floor.
And Russell Simmons arrived with Aussie beauty Sophie Monk and "spent the night telling everybody she was the hottest girl at the party."