John Mayer and Dolly Parton sang for Andy Cohen's 50th birthday Watch What Happens Live special
Parton called in, while Mayer sang Cohen's favorite Diana Ross song in celebration of the Watch What Happens Live host's 50th birthday. Mayer, one of Cohen's closest friends, was also the surprise guest-host for Cohen's tribute. ALSO: Cohen and Mayer revealed they recently smoked pot with George R.R. Martin.
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