Paris Hilton & River Viiperi: Batman & Robin Duo

Posted Thursday November 1, 2012 4:25 PM GMT

Setting out on a superhero spree, Paris Hilton and her boyfriend River Viiperi had a blast during last night’s Halloween holiday.

The “Simple Life” starlet and her man candy hit up the annual Greystone Manor shindig wearing corresponding Batman and Robin getups.

And Paris seemed thoroughly enjoy the star-studded party, mingling with guests and posing for plenty of pics.

She tweeted, ''Having an amazing time at @Rihanna's Halloween party with @RiverViiperi @FarrahBritt @Whittles2 @BrookeBrinson @BarronHilton @VanessaDuBasso.''

Photo Credit: AKM-GSI