Like mother, like daughter!
A source tells ET that the two stars planned the family vacay for a time when Kate's sons, Bingham and Ryder, were out of school, and that Muse frontman Matt Belamy -- Kate's ex and Bing's dad -- joined them on the trip. Matt kept an eye on the kids, giving the girls a chance to play in the surf.
Along for the vacation were Kate's besties, stylist Sophie Lopez and Kari DeLonge.
Kate, who rocked a tiny, nude bikini, and Goldie, in a blue one-piece, seemed to have a great time. According to the source, the girls were "posing for cute pics and splashing around in the water."
It just goes to show there's nothing better than European family beach vacation.