Natalie Portman Fuels Up

08/17/2010 AT 10:00 AM ET

Did she work up an appetite? Rumer Willis, dressed casually in a Market T-shirt, headed out to lunch with a pal at Urth Caffe in West Hollywood – then enjoyed a walk in Runyon Canyon with Ashton Kutcher and their dogs. At lunch, the starlet was in “chipper spirits,” an onlooker says.

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