"Working with Rob was amazing," she told E! Online. "He's such a great guy, so talented.
"He's just great. We'd just make fun of each other the whole time, like ‘oh my god we're so goofy' or ‘my accent is so bad!'"
Christina and R-Pattz play lovers in the film, so of course they got to know each other pretty well indeed.
"There's some naughtiness," she revealed, saying there are "lots" of love scenes bewteen her and the teen dream. When asked if Rob is a good kisser, Christina replied. "Um yeah! He is pretty much awesome."
Christina revealed that Rob's girlfriend Kristen Stewart came to visit onset, describing her as "totally sweet" - and that she gets why Kristen and the rest of the female population are so taken by the hunky actor.
"I understand where they're coming from," she said. "He's an awesome human being. He's so funny and quirky and weird."