HEIDI KLUM stole the show at the Las Vegas Grand Prix by going topless. The supermodel was among a horde of A-List celebrities in attendance as the Formula 1 roadshow hit Sin City. She shared a series of pictures and videos from her outing to her 11.7million Instagram followers. She also excitedly posted a short video of cars zooming past from her seat in the stands. On Friday night Heidi attended a Mariah Carey concert, having her picture taken with the legendary musician after the show. The gig was nearly as star-studded as the F1, with Kim Kardashian also there.

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