The 'We Are Done' hitmaker's friends can't resist poking fun at him for dating the A-list actress and joking that he has changed since they got together earlier this year.
A source told the US edition of OK! magazine: ''His friends tease him about being henpecked. They're calling him Senor Diaz and slamming him for being 'so A-list now.' He can't stand it.''
The 35-year-old rocker, who is rumoured to have secretly proposed to the 'Sex Tape' star last month, is still adjusting to Cameron's high-profile lifestyle and they have allegedly been arguing about who to invite to their wedding.
The insider said: ''Benji would love to just marry her in a drive-through chapel.
''All the friends he wants to invite have to go through a rigorous security screening, and it's embarrassing for Benji.
''Benji had no idea what dating someone so famous would be like.''
Asked if she set them up, she previously said: ''Yes. I'm going to take responsibility for everything!''