Miley Cyrus' mystery man is Liam Hemsworth's friend Paul Khoury - report

While Miley Cyrus denies rumors that she's ended her engagement with Liam Hemsworth, there's some evidence that points to there being trouble in paradise. First the singer was spotted out and about without her engagement ring, and now it seems Cyrus was picked up by a new mystery man Thursday night, to go to a friend's party.

Is there anything to be worried about, though? According to Us Weekly, the "mystery man" is actually a friend of Hemsworth's named Paul Khoury. After some time at the party, Khoury drove Cyrus home.

Miley and Liam seem to be going through a pretty rough patch at the moment. Trouble started brewing when Hemsworth allegedly got a little too friendly with "Mad Men" star January Jones at a pre-Oscar party. A source tells People that the wedding isn't off, but "Miley and Liam have had some problems that they are working through." The source claims Miley still loves and plans to marry Liam.