QB Tom Brady may have been named the Super Bowl MVP, but we all know that without the miraculous interception by cornerback Malcolm Butler, it would have been just another frustrating NFL finale for your New England Patriots. That’s why Butler has been so in-demand since his return from Phoenix. The rookie was taken to a Celtics game by team owner Robert Kraft, invited to visit the young patients at Boston Children’s Hospital Friday, and asked to host a championship party at the Chateau Nightclub & Rooftop in Las Vegas Saturday. (The rookie was scheduled to make an appearance Saturday at Sportsworld in Peabody, but apparently the party in Vegas took precedence.) . . . Meanwhile, every time we turn around, it seems Pats party boy Rob Gronkowski is making another TV appearance. (Friday, it was “Live With Kelly and Michael,” during which Gronk said his heart “sunk with joy” after Butler’s interception. We think he meant “jumped with joy.”) This week, coach Bill Belichick will be logging some screen time, sitting down Wednesday with David Letterman. It’ll be Belichick’s second appearance on Letterman’s CBS show. He was on in 2004 after the Pats won their second Super Bowl.