This movie stars Chris Pine (who played Captain Kirk in the latest Star Trek movie) and Tom Hardy (who played the bad guy, Shinzon, in the Star Trek movie before that). But this movie is a romantic comedy set on Earth, and includes Reese Witherspoon as the love interest.
Pine and Hardy are CIA agents FDR and Tuck (respectively), best buddies, on the hunt for international bad guy, Heinrich. In an initial action scene, Heinrich's brother is a casualty; Heinrich escapes, but vows revenge against our heroes. (This doesn't matter much until the end.)
In the meantime, both FDR and Tuck become enamored with Lauren (Witherspoon). In pursuit, each uses deception, dirty tricks, and surveillance tactics in order to gain advantage in the competition for Lauren's affections. This strains their friendship to the breaking point. Lauren is torn about which guy to choose, she's unaware that they know each other, and (of course) she's eventually placed in peril by Heinrich's reappearance.
Bottom line: it's got numerous chuckles along the way, doesn't take itself very seriously. It's predictable, but entertaining. Not an awful way to spend a movie night.