Stephanie Pratt really knows how to party!

Stephanie Pratt and her boyfriend

Stephanie Pratt and her boyfriend

The Hills-star Stephanie Pratt and her boyfriend held hands as they left a nightclub in Hollywood. If you didn't already know Stephanie stars alongside her brother, Spencer Pratt in the reality show. You can see that she works with fashion but you can also see that she has been partying hard all night long.

Looks a little bit sweaty!