Rihanna: What Happens in Vegas...

Rihanna checks messages on her phone as she walks through McCarran airport on Sunday (September 19) in Las Vegas, Nevada.

The 22-year-old Bajan beauty was in town for the weekend to host pal Katy Perry‘s bachelorette party!

While in Vegas, RiRi, Katy and friends had a fun poolside party and took in a Cirque du Soleil show before going to a nightclub and dropping by a strip club!