Ru never misses a hot party!

Rumer Willis hit up the Nylon Young Hollywood Issue party at the Roosevelt Hotel last night, and we love her understated all black ensemble! Some celebrities try too hard with their fashions, but Bruce and Demi's eldest daughter always manages to effortlessly nail the right look!

We wonder if she got a dog sitter for her night on the town? Miss Willis recently adopted this adorable puppy from an LA animal shelter... aww, what a cutie! Fun fact - the pooch is Miley Cyrus' dog Happy's sibling.

See who the curly haired redhead was spotted partying with after the jump...