While doing an on-air interview with the Australian radio show Kyle and Jackie O, Miley Cyrus sounded a little bitter about Justin Bieber’s success. The former Disney star, who’s going to Australia in June to do a series of concerts, commented, “It should be harder to be an artist. You shouldn’t just be able to put a song on YouTube and go out on tour.” Ouch! Does that sound like sour grapes to you as her celebrity diminishes following the end of her once-popular show, Hannah Montana? She also doesn’t seem to know if she has a boyfriend or not, saying, “I don’t want to cross out the Australian boys but I may or may not be single…I’m definitely not coming to Australia single.” Huh? What does that mean? Either she has a boyfriend or she doesn’t. She couldn’t have an aversion to Australian men — having dated Aussie actor Liam Hemsworth for several months. She was also dismissive of her bong smoking video that created a stir, brushing it off with, “I mess up. There you go.”