More money, more problems! Kim Kardashian became a billionaire overnight when the 39-year-old reality star struck a $200 million deal with Coty for a 20 percent stake in her makeup brand, KKW Beauty. Little sister Kylie Jenner, who’s recently been accused of falsely inflating her wealth, “acted like she was thrilled for Kim and congratulated her,” says a source, “but deep down, she’s green with envy.” Last year, Forbes magazine crowned the 22-year-old lip kit queen the youngest self-made billionaire in history after Coty bought a 51 percent stake in Kylie Cosmetics for $600 million, only to strip her of her title for “creating tax returns that were likely forged.” (“I’ve never asked for any title or tried to lie my way there ever,” she fired back in response.) “Kylie’s…