According to Reveal magazine, the reality TV star was "mortified" when a fan referred to her as Gemma at a nightclub earlier this week.
A source claimed: "Lauren was partying at a London nightclub when she overheard someone say, 'Look, there's Gemma from TOWIE.
"She had her back to the group of girls who'd spotted her and to Lauren's horror she realised they were talking about her.
"Gemma wasn't even at the club that night and Lauren was mortified. Lauren checked her reflection and is now convinced her rear view isn't great."
In March, Goodger was quoted as admitting that she was "so unhappy" about her weight.
The insider added: "Lauren's worried she'll end up as big as Gemma. She's struggling to control her eating and is constantly seeking reassurance from her friends."