The rivalry between Mischa Barton and Kristin Cavallari, the dynamic between Tobey Maguire and Jake Gyllenhaal, the competition between Wilmer Valderrama and…

The rivalry between Paul Wall and Mike Jones, the clash of Andy Milonakis and Steve-O, the contest between Vince Vaughn and...

Chris Rose against Rob Dibble, against Rodney Peete, against John Salley. Carson Daly against Jimmy Kimmel. Tina Fey against—

The rivalry between Lil' Bow Wow and Lil' Romeo, the clash of Lil Wayne and Lil' Flip, the tension between Lil Jon and…

The comedic rivalry between Dave Chappelle and Carlos Mencia, the infamous story of Ashley Simpson's altered nose, Ludi's encounter with Criss Angel, and R. Kelly's relationship with Clarkson.

Adrian Grenier versus Jeremy Piven. Rev Run against Russell Simmons. Orlando Bloom versus...

The rivalry between Nick Lachey and Jessica Simpson, the competitive spirit of "The Game," the presence of 50 Cent, and the dynamic involving Lindsey Lohan... these elements converge.

Anna Kournikova versus Danica Patrick. Chris Pontius against Mark Zupan. Barry Bonds versus—