The 39-year-old singer-turned-socialite - who has a paid partnership with Nobu Hotel Los Cabos - was celebrating the 40th birthday of her stylist Natalie Saidi
Alicia Silverstone and Ashlee Simpson glam up to sit front row at the Christian Siriano FW/24 fashion show in NYC dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.
The 41-year-old clothing mogul flaunted cleavage in a gold and silver embellished gown while her 37-year-old sibling opted for a lavender feathered frock