Mmm the world's most famous lips and I have always envied her because of my thin lips! But i have came across a product that does a little bit to help my problem when i was visiting America.
DuWop Lip Venom
This product is a strong lipgloss that and i quote "enhances the natural colour and shape of the lips by increasing circulation with a spicy, tingly blend of essential oils including cinnamon and ginger". I use it with a full face of makeup, when lipstick is too much and it makes my lips stand out or i will put it on top of my lipstick coat for fuller lips. But I warn you, the first couple of applications stings your lips!