Marnie, 20, is the younger cousin of ex-Geordie Shore star Sophie Kasaei and she was previously a runner-up in the Miss Newcastle competition.
Speaking about her new role to MTV News, Marnie hinted that she didn't get off to a great start with her fellow Geordie lasses - Holly Hagan, Vicky Pattison and Charlotte Crosby - when filming began.
"I've seen the way they reacted with Rebecca [Walker] but I'm Sophie's cousin so I thought that, with them knowing us a little bit already, it wouldn't be as bad for me," she admitted.
But Marnie added: "I've bonded with the boys more than the girls. But then I got close with the girls towards the end."
When asked if she had encountered any romances while filming series 7, Marnie admitted: "I got close to Scott [Timlin] and we got on really well."
Marnie promises to "stir things up" and "bring drama" to the show, plus she also hopes to injected some fun!
Geordie Shore returns to MTV on 17 September at 10pm.
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