Newlyweds Kate Hudson and rocker Chris Robinson giggled to pals about the shock he got during a family outing in Colorado when he pinched Kate on the butt, kissed her neck, whipped her around to plant a wet one on her lips -- and FREAKED! Chris was face-to-face with (EEK!) mother-in-law Goldie Hawn! Goldie guffawed, as did Kate -- but nobody's told Kurt Russell yet, so . . . ssshhh!