When Vogue editor Anna Wintour talks, models listen. Maggie Rizer is dying her hair back to red today. “Anna said, ‘I’d like to see Maggie as a redhead,’ ” a source told The Post’s Annie Karni. “Blond is her natural color, and she really doesn’t want to go back to being a redhead. But she felt enormous pressure to do it.” Rizer started her career in the ’90s with red hair, but has tried out platinum and has recently been sporting her natural flaxen locks. She’ll likely be Titian-tressed when she ties the knot with Alex Mehran, a real-estate developer, later this year.