The Ugly Truth (2009)

Director: Robert Luketic
Genre: Comedy | Romance
Starring: Katherine Heigl, Gerard Butler, Eric Winter, John Michael Higgins, Nick Searcy

Plot: A romantically challenged morning show producer is reluctantly embroiled in a series of outrageous tests by her chauvinistic correspondent to prove his theories on relationships and help her find love. His clever ploys, however, lead to an unexpected result.

http://www.imdb.com/title/tt1142988/
http://en.wikipedia.org/wiki/The_Ugly_Truth_(film)

Abby Richter is a romantically challenged morning show producer whose search for Mr. Perfect has left her hopelessly single. She's in for a rude awakening when her bosses team her with Mike Chadway, a hardcore TV personality who promises to spill the ugly truth on what makes men and women tick.