We don't wanna believe it because we think Zac is so HOT and is too nice to be jealous of anyone else.
The rumor is that Zac was really upset that Rob was getting so much attention at the MTV Movie Awards.
“Zac couldn’t believe the amount of attention Robert got at the MTV Movie Awards,” a source told Popeater.
“It was only yesterday that Zac was Hollywood’s golden boy, enjoying making young girls scream. That didn’t happen this year. All the girls wanted Robert and barely even noticed Zac.
It's so funny how these young Hollywood stars try so hard to be "serious actors" and to get away from that teenybopper phase, but once the attention is gone they get worried. They're just never satisfied and always insecure!