India, July 11 -- Rachel Reilly returns as the mystery houseguest on Big Brother 27. "I'm back!" she declared during the season premiere. "I'm here to show these newbies how to play Big Brother."

Reilly then announced, "Floaters grab a life vest. Reality royalty has officially arrived. I hope you're ready for a summer filled with the Rachel Reilly."

Who is Rachel Reilly?

Born in Concord, North Carolina, on October 16, 1984, Rachel Reilly is a prominent reality TV figure. She won Big Brother Season 13 as well as Celebrity Fear Factor and Snake in the Grass. She also competed on The Amazing Race.

Reilly has appeared on The Bold and the Beautiful and The Price is Right. She has also hosted shows like Better with the Brenchels and Reality...