Britney Spears poked fun at her recent underwear controversy when she flashed paparazzi her covered bottom during her 25th birthday party at the weekend (01DEC06). The pop star looked stunning in a skin-tight mini-dress as she arrived to celebrate her big day with friends at Beverly Hills restaurant Mr Chow. And Spears gave paparazzi outside a real eyeful when she stood in front of a large window and posed for them, making sure to bend over and give them a glimpse of her lingerie. Spears hit the headlines twice last week (ends01DEC06) when she was snapped out partying without her panties. She reportedly spent a whopping $3,800 (GBP1,950) on underwear at trendy Hollywood boutique Le Bra Lingerie last week.