Congratulations Selena Gomez and Ethan Hawke: you are in the single worst movie of the year. “Getaway,” which opens tomorrow, rates a big fat Zero on Rottentomatoes.com. Fifty five reviews are negative. None are positive. “Getaway” outranked such other horrors as “GrownUps 2” (7%), “Paranoia” (3%) and “RIPD” and “The Lifeguard” (each 11%). “Getaway” co-stars Jon Voight (who’s used to better effect on Showtime’s Ray Donovan) and soap star Rebecca Budig. Someone named Courtney Solomon directed it. Hawke is a former Oscar nominee (“Training Day”) who should know better. But poor Selena. She may have to stick to singing and teasing Justin Bieber.