Jessica Simpson stepped out on her birthday with a brand new look. Simpson, who turned 45 on July 10, shared several photos from her celebration at Chateau Marmont on Instagram July 11.

After years of a bleached blonde look, Jessica Simpson has been slowly darkening her locks over the past few months. It began with a dramatic "desert sunset blonde" transformation in May—and now, to mark her 45th birthday, the singer has gone even darker.

Jessica Simpson showed off a darker hair transformation in an Instagram post on July 11, as she continued to mark celebrations for her 45th birthday. The actress and singer, who wore a sexy, see-through dress,