Jenni 'JWoww' Farley is expecting a baby girl.

The 'Jersey Shore' star - who will welcome her first child with fiancé Roger Mathews into the world in July - was ''super excited and super emotional'' to find out the gender of her tot, especially as she was convinced she was carrying a boy.

She said: ''I pictured a boy this whole time, so when I saw 'girl' on the paperwork, I was like, 'No way!' But deep down I think I knew.

''[Snooki's son] Lorenzo is gonna have a BFF, and I couldn't be happier!

''She will be my best friend and daddy's little girl. I can't wait for everything from her first steps to her first dance class.''

While the 27-year-old star is excited about having a daughter, she isn't looking forward to her teenage years.

She told Us Weekly magazine: ''I was a teenage girl once, and, boy, do I know how sneaky we can be! Karma is gonna kick me in the butt with her!''

And her 37-year-old fiancé is already thinking of ways to keep his daughter on the right track when she is a teenager.

JWoww said: He was just saying today what kind of car she'll get for her sweet 16 if she gets good grades. I'm like, 'Pump the brakes! Let's get through the first 16 months!'''