Nerd alert! JWoww and fiancé Roger Mathews geek out for Las Vegas Halloween party

Revenge of the nerds: Jenni 'JWoww' Farley ditched her usual annual racy costume in favour of looking like a four-eyed nerd alongside her fiancé Roger Mathews at a Las Vegas Halloween party Saturday

The on/off couple, who've been together for two-and-a-half years, served as the evening's official hosts at Chateau Nightclub and Gardens at the Paris Hotel and Casino.

The 26-year-old reality starlet appeared to enjoy her transformation, eagerly crossing her eyes and pulling faces while wearing a short-sleeved dress shirt, white suspenders, pink plaid pants, argyle socks, and patterned sneakers.

However, the usually glamorous JWoww could not bear to part with her beloved false eyelashes, which could be seen behind her thick-framed glasses held together with tape.

Geeking out: The on/off couple, who've been together for two-and-a-half years, served as the evening's official hosts at Chateau Nightclub and Gardens at the Paris Hotel and Casino

'Geek squad': The loved-up pair were joined by the rest of their 'geek squad' while on the red carpet, who were also clad in mixed patterns, glasses, and pocket protectors

Pulling faces: The usually glamorous JWoww could not bear to part with her beloved false eyelashes, which could be seen behind her thick-framed glasses held together with tape

The Jersey Shore star proudly held up her massive cushion-cut engagement ring as she posed with the similarly-attired tattooed bodybuilder.

The 37-year-old proposed to JWoww during a skydiving session last month.

'The whole time I’m screaming, What are you doing? What’s going on? He’s like, I want to spend the rest of my life with you! Will you allow me to?’ she told In Touch.

Engaged! The Jersey Shore star proudly held up her massive cushion-cut engagement ring as she posed with the similarly-attired tattooed bodybuilder

Of course, the answer was an unequivocal yes. 'If I had to imagine a perfect guy, it would be him,' Jenni gushed.

The loved-up pair were joined by the rest of their 'geek squad' while on the red carpet, who were also clad in mixed patterns, glasses, and pocket protectors.

Once inside the night club, the nerdy clan danced to DJ Scribble and posed with a fellow partygoer wearing an enormous Ted costume.

Halloweekend: Once inside the night club, the nerdy clan danced to DJ Scribble and posed with a fellow partygoer wearing an enormous Ted costume

Make-under: The 26-year-old reality starlet appeared to enjoy her transformation, wearing a short-sleeved dress shirt, white suspenders, pink plaid pants, and argyle socks

The pretty brunette obviously has a lot to celebrate since, aside from her upcoming nuptials, the second season of her spin-off Snooki & JWoww is set to return to MTV on January 8.

JWoww has promised that the second season will be far better than the first season, what with 12 hour-long episodes featuring her televised wedding and the birth of Snooki's son.

'Lorenzo, the engagement, drama, good times,' Farley told MTV News. 'I don't know how it's going to unfold; I just lived it. And I just know it was the best two months of my life.'

Congratulations! The 37-year-old proposed to JWoww during a skydiving session last month