Los Angeles - Jennifer Aniston has been accused of acting like a "diva".
The 44-year-old actress - who is engaged to actor Justin Theroux - has reportedly isolated herself from the rest of the cast on her new movie Untitled Elmore Leonard Project in Connecticut and has been purposely hiding out in her luxurious private trailer alone.
A source close to the set of the comedy, which also stars Isla Fisher and Tim Robbins, told gossip website RadarOnline.com: "Every day at lunch the entire cast and crew head to a cafeteria facility where they all sit down and eat lunch together for well over an hour.
'She's not approachable'
"But the only person who doesn't eat with everyone else is Jen. She quickly grabs a lunch to go and leaves.
"All the actors ride in normal production vans when they head to lunch, but Jen has her own luxury SUV.
"And not only is Jen's private trailer miles away from the set, but she heads all the way back there each day to eat her lunch away from everyone else.
"Her behaviour is a clear indicator to everyone that she's not approachable. And it's just unnecessary. There's no reason why she has to act any better than anyone else on that movie set."
The actress walked the red carpet with her fiance Justin at the Oscars on Sunday and wowed onlookers in a red Valentino gown.