Tara Reid knows the truth about diamonds: Stock up while you can. Or so it seemed at Rose McGowan’s private luncheon at the Diamond Acquifer Oscar suite at Soho House in Hollywood. Twenty of her pals were on hand, including Donovan Leitch and Kirsty Hume, and a pricey gift bag that included a $1,000 diamond bracelet had been set aside for each. But, “Tara and some friends came and swiped almost all of the gift bags,” a supremely miffed Diamond Acquifer employee.