The Margin Call actress, 49, and her eldest with second husband Bruce Willis both kept casual in sunglasses and jeans as they met up with a pal; slim Moore looked chic in a black leather jacket.
Moore, of course, has kept a low profile since late November, when she announced the end of her marriage to Ashton Kutcher following his revealed September affair (on their sixth wedding anniversary!) with 22-year-old Sara Leal in San Diego.
She bowed out of a family outing to Paris over the post-Thanksgiving weekend -- when Rumer joined dad Bruce, 56, his wife pregnant wife Emma Hemming, and sisters Scout, 20, and Tallulah, 17. The group were in the City of Lights for Tallulah -- one of the socialites debuting at the Le Bal des Debutantes.
And despite speculation to the contrary, Moore hasn't yet rebounded from Kutcher, 33 -- instead quietly dining in Hollywood with platonic pals.