Just the pair of celebrities you automatically assume will be hanging out together and that you'll see smiling photos of every day, right? Definitely.

Rumer Willis - daughter of Bruce Willis and Demi Moore, stepdaughter of Ashton Kutcher, friend of Lindsay Lohan and Hayden Panettiere - was seen partying it up at the Maroon 5 concert at the Pearl Theater at the Palms in Las Vegas.

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