Happy Monday — feast your eyes on these amazing photos of Zac Efron shirtless! He arrived in Hawaii over the weekend with his brother Dylan, and the abdominally gifted duo hit the beach together yesterday morning. Zac arrived in Maui to have some downtime ahead of his appearance at the island's film festival later this week. He's set to receive its Shining Star Award and will be on hand for a special tribute in his honor on Wednesday. We've been treated to the sight of Zac's muscles many times before, but it looks like he's been hitting the gym extra hard to prep for a Summer that's hopefully full of six-pack sightings.