An insider says the star's sudden success has gone straight to her head -- and she's become a demanding control freak on the set of her popular cable series Girls. "On hot days, Lena makes a production assistant act as her personal 'umbrella technician,'" a source revealed. "He's in charge of waiting outside her trailer and following her everywhere on set to protect her fair skin from the sun."

Lena also demands that and assistant fetch her lunch and hand-feed it to her. She says she doesn't want to break a sweat in her show clothes or ruin her makeup. "On top of that, Lena has someone read all three of the New York daily newspapers every day and write up a synopsis so she can always be up on current affairs." (Print Edition - 10/14)