All aboard the Soul Train! Big-haired birthday girl Beyonce teases her VERY low-cut fancy dress costume as she and Jay Z lead showbiz pals at her 35th

She's usually the star of the show, but Beyonce went above and beyond on Monday night for her birthday party.
The 35-year-old rang in her big night with a
Soul Train themed bash, which attracted some big names - as well as some incredible fancy dress costumes.
Busty Beyonce teased only a glimpse of her retro and racy ensemble, draped in a long coat, as she arrived on the arm of her husband Jay Z, 45, for the New York City party.