Kate Hudson is obsessed with ballroom dancing and loves the "sexy" outfits.The 'Almost Famous' actress - who has sons Ryder, nine, with ex-husband Chris Robinson, and Bingham, 21 months, with fiancé Matt Bellamy - loves the "sexy" pastime and enjoys splashing out on new outfits to appear "almost naked" on the dancefloor.She admitted: "Oh my God, I love it. I've learnt the cha-cha and the tango."I'm having dresses made. Those colours and flounces are totally my guilty pleasure. The whole thing's an excuse to go out on to the dancefloor looking almost naked. With sequins. It's so sexy."Kate began taking dance classes when she was just four years old, and believes the hobby will always keep her in good shape, citing her mother Goldie Hawn, 67, as a good example.She added in an interview with the new issue of Britain's Elle magazine: "I mean, look at my mom, she looks amazing."