The cast of Jersey Shore invaded Las Vegas Saturday night and it was all in support of another reality hit, Real World, RadarOnline.com has learned.

PHOTOS: Real World Meets Jersey Shore In Sin City

Deena Cortese, the newest cast member of Jersey Shore, and veteran Pauly D were front and center for the Real World Las Vegas 2011 premiere party held at Club Vanity in the Hard Rock Hotel Casino.

Real World Las Vegas stars Dustin Zito and Adam Royer also came out to party.

PHOTOS:  J-WOWW Is A Vegas Birthday Girl

Deena and Pauly D will be in Sin City all week co-hosting Spring Break at the Palms for MTV.

Pauly’s a regular DJ at the Palms, and for this occasion he will be spinning tunes by the pool, joined by Wiz Khalifa, Pitbull, Lupe Fiasco, Snoop Dogg and Jason Derulo.

PHOTOS:  Jersey Shore Guys Show Off Their Beach Bods

Sammi “Sweet Heart” Giancola will be joining Deena in Vegas next weekend to celebrate her 24th birthday.  The pair will be co-hosting at the new Chateau Nightclub  on March 12.

RELATED STORIES:

Snooki and The Situation Hook Up on Season Finale

PHOTOS: See J-WOWW Before She Was Famous

PHOTOS: Snooki At The Grammys

PHOTOS: Topless Bikini Babes

PHOTOS: Coco’s Scandalous Style Over The Years

Hometown kids Common and Jennifer Hudson, along with other notable Windy City phenoms like Lupe Fiasco and No I.D., recently collaborated to record a tribute to the famous town.

The finished product “We Can Do It Now” also celebrated the famed series REPLAY (read more about the series here).

VIDEO: Jennifer Hudson Talks Old Weight & New Film

REPLAY, which was created by Gatorade, allows old sports rivals to restage games in hopes of changing the outcome, often ten to fifteen years after the first go-around!

Gatorade not only provides a setting for the reunion but also provides an 8-week training and nutrition program to help the former athletes get back in shape.