When I think of flowers in my hair [1], I picture bright colors and island vacations, not quite the things I'd associate with teen vampire movies. However, these attendees of the Twilight premiere in LA [2] all chose floral adornments. Hmm, perhaps that song [3] oughta go, "If you're going to a vampire movie, be sure to wear black flowers in your hair."
Anyway, the three ladies had different takes on this hair accessory – but all chose to make a more subtle statement with fake flowers in neutral shades.

Take Jennie Garth, who uses a beaded flower-shaped barrette to hold her hair over her ear – pretty! Then one of the film's stars, Nikki Reed, held back a messy, sideways braid with a black flower I swear I bought at H&M. Finally, Catherine Hardwicke wears a huuuge flower on her ponytail – she's the film's director, so why not go over the top?

Source [4]