Reese Witherspoon re-emerged for a pal’s party in Los Angeles on Monday — and sported a black eye and a bandaged forehead, The Oscar-winning “Walk the Line” star was jogging last Wednesday around 11 a.m. near 20th Street and Georgina Ave., in Santa Monica when she was struck by a car.Despite the injuries, Witherspoon cheerfuly unloaded gifts from the trunk of her car.