Now, Olivia is the name du jour, with three stars boasting the moniker. Can't tell them apart? Don't worry, we've got your cheat sheet right here:
Olivia WildeBest Known for: Her role as troubled doctor Thirteen on the hit Fox show, House
Love Life: After splitting from husband Tao Ruspoli, this Olivia was linked to Justin Timberlake and, most recently, Bradley Cooper.
Did You Know?: She famously locked lips with Mischa Barton during a girl-on-girl kiss during The O.C.'s second season
Olivia MunnBest Known for: This Olivia is familiar to techies as the co-host from G4's Attack of the Show, but the actress/model is more popularly known from her gig as a Daily Show correspondent.
Love Life: After splitting from Star Trek actor Chris Pine, this Olivia was spotted getting cozy with Glee star Matthew Morrison.
Did You Know?: This Olivia plays the snooty hostess who gives Tina Fey and Steve Carrell a hard time in Date Night.
Olivia WardBest Known for: Winning the recent season of The Biggest Loser with a total loss of 129 lbs.
Love Life: She's married to Ben Ward, who lost more than 100 lbs., while she competed on the show.
Did You Know?: This Olivia is also an opera singer in New York.