Lindsay Lohan proved that when it comes to fashion, she can still spark a riot. She spent all afternoon flexing the plastic with her sister, Ali, and mom, Dina, at Intermix in Manhattan the other day. A witness told us, “They had to close down the store because of overcrowding. Hundreds of people lined the windows to watch her pick out her favorite items.” Let’s hope her next collection for French fashion house Ungaro is as big a hit.