The actor she hooked up with is also in a relationship.

This married B+ list mostly movie actress who is married to an A+ lister hooked up with the getting more famous than his brother actor after a recent party.

The actor she hooked up with is also in a relationship.

Amber Heard & Johnny Depp
Famous brother: Chris Hemsworth
Getting more famous/relationship: Liam Hemsworth  & Miley Cyrus

Source: http://www.crazydaysandnights.net