Jason Kempin/Getty ImagesOf course Pink s concerts are filled with great music, dancing and death-defying stunts. But Pink says another reason you should go see her on her Summer Carnival Tour, which starts up again in June, is to admire her butt.She posted a video on Instagram giving a behind-the-scenes look at the tour, including several shots of her wearing scanty outfits that show off her booty. "I have so much a in this show," she says. "This is the most a -alicious show.""And you know what? F A right, doggie daddy! I worked for that booty," she laughs. "The world needs more 44-year-old booty."In the video you can see Pink rehearsing, working out, practicing her aerial stunts, playing with her kids backstage and then performing during the actual show. It s all set to "Never Gonna Not Dance Again," the first single from her most recent album, Trustfall, and ends with a shot of Pink wearing a jacket with "Kiss