Today's lucky recipient of Amanda Bynes' Twitter wrath is Miley Cyrus, whom Bynes slammed in a short and not-so-sweet tweet shortly after midnight. "Ur ugly @mileycyrus," wrote Bynes, using her Twitter insult of choice. In recent weeks, the troubled child star turned wannabe rapper has called a number of others ugly on the social media site, including her dad, her former crush Drake and Rihanna -- although she later claimed an imposter had written the nasty RiRi tweets. "This is my twitter. I say whatever I want," Bynes later wrote. "Thanks!" Uh … you're welcome!