Over the weekend, Motley Crue were joined by none other than Papa Roach vocalist Jacoby Shaddix on their famous cover of  'Smokin' in the Boys Room' at the Hard Rock Hotel in Las Vegas.

Motley Crue kicked off their Las Vegas residency with two sold-out shows where they rolled out explosive classics like 'Shout at the Devil,' 'Looks that Kill,' and 'Girls Girls Girls' as well as an acoustic set. The audience at Saturday night's (Feb. 5) show received an extra special treat, when the Crue were joined by Papa Roach singer and former Crue Fest tour mate Jacoby Shaddix.

Shaddix traded vocal lines with Vince Neil on the fan-fave 'Smokin' in the Boys Room,' which could be the first of several special guest appearances to take place during their nine remaining gigs at the Hard Rock. Motley Crue resume their residency on Wednesday, Feb. 8, while Shaddix will likely continue work with Papa Roach on what they've called "the record of our career."

Motley Crue Perform 'Smokin' in the Boys Room' With Jacoby Shaddix