It may be Sunday, but the stars are still out to play on Twitter. Today's best tweets came from 'The Voice' runner-up Dia Frampton, who seemed frustrated by how her height hinders her ability to date short guys. We also got a double-whammy tweet from Adam Levine, who was spending some quality time with his four-legged friends. Elsewhere, Jessica Simpson celebrated her 31st birthday, and took to Twitter to thank fans for the well wishes. Oh, and Justin Bieber used his Twitter to tweet-announce a South American tour for later this year!