Christina Milian fired up Instagram, not only in a see-through dress, but in an Island Girl bikini while showing off her fabulous tiki huts today. The 39-year-old pop singer and Netflix star's Tuesday update came with a tropical Mauritius geo-tag and a super-stylish and summer wardrobe fit for the beach setting. Christina, followed by 6.4 million, doesn't post for free, though, with her double-photo update coming as promo for the Fashion Nova brand she holds a partner status with. Check it out below.