Note to Makeup Fans: The Urban Decay brand has unveiled its newest collaboration with American influencer Kristen Leanne. Palettes of eye shadow, lipstick or highlighters, you will want to buy everything. To the chagrin of those who share our lives and our bathrooms, we will probably never have enough to enrich our makeup kit of novelties of all kinds. After the new Backtalk Urban Decay palette, get ready to crack again.   A rock collection for Urban Decay Urban Decay knows exactly how to make us crack and that is why we are all fans of the Urban Decay brand. After collaborating with singer Gwen Stefani, the brand has unveiled…