According to an eyewitness at the party, at some point in the evening, Carmen passed Brown en route from the restroom. Breezy made his move, telling the stunner that she "smells amazing."

Note to guys… We're guessing that this cheese-filled pickup line rarely works unless, of course, you're Chris Brown. But, even in this case, the "Don't Judge Me" singer got shut down.

Unable to handle the bizarre comment, Carmen thanked Brown. The eyewitness tells HS that Brown, "asked if he could smell her and then buried his face into her neck."

Brown sniffed the model up and down as if he were a prospector searching for nose gold… yeah, it got weird.