Zac Efron hit the red carpet at The Lucky One premiere in Melbourne today with his lovely costar Taylor Schilling. Australian fans went wild for Zac at yesterday's premiere in Sydney, where he joked about sharing his hotel with Rihanna. Rihanna and Zac spent time relaxing on the balcony of their respective suites. Rihanna snapped photos of the picturesque scenery while Zac took off his shirt and flashed his well toned abs. Zac's stay Down Under is winding down, and he's expected back in the States this weekend for additional press prior to Monday's star-studded LA screening.