Hollywood star Kate Hudson took a night off babysitting her son RYDER to party with future sister-in-law ERIN BARTLETT on Saturday (06MAY06). The ALMOST FAMOUS star's older brother Oliver Hudson is preparing to marry Shallow Hal beauty Barlett this summer (06) after a two-year engagement. Hudson was the star guest at Bartlett's bachelorette (hen) party at Las Vegas, Nevada's Fix restaurant at the Bellagio Hotel + Casino, before dancing the night away at trendy nightspot Light.