Look closely! The star has a tiny scar-colored tat on her hand that reads "H20." Jennifer confessed to E! Online that she got the ink on a whim with costar Liam Hemsworth. "I'm always going to need to be hydrated," she pointed out. "It's literally the most unrebellious tattoo that anybody could ever get." You may have noticed that the 2 is superscript, not subscript — Jennifer knows she messed up. "I should've Googled it before I got it tattooed on my body forever," she remarked.