The success of a movie is often due to its cast, and that’s no exception with the “I Love You, Man” cast. This hilarious comedy, which surprisingly grossed almost $100 million in 2009, could easily be mistaken for another of Judd Apatow’s “bromance” films, even though he had no involvement in the project. Filled with great performances, here are the best of the “I Love You, Man” cast.

  1. Paul Rudd as Peter Klaven Paul Rudd, actor and screenwriter, finally got his chance to star in a movie of his own after playing supporting characters in the Apatow movies “The 40 Year Old Virgin,” “Anchorman” and “Knocked Up.” He got his first big break when he played Alicia Silverstone’s love interest in 1995’s hit “Clueless” and is also known for playing Phoebe’s boyfriend and husband on the sitcom “Friends.” Here he plays Peter Klaven, an everyman nice guy who works as a real estate agent. Klaven is engaged and realized he is woefully short of male friends and the movie’s plot revolves around his often hysterical attempt to find just the right male friend to act as his best man.

  2. Jason Segel as Sydney Fife: Segel, actor, writer and musician, is best known for his work with Judd Apatow (the movies “Knocked Up” and “Forgetting Sara Marshall” and the television series “Freaks and Geeks” and “Undeclared”). He is also known for his role as Marshall Erikson on the hit sitcom “How I Met Your Mother.” In this film he is the answer to Klaven’s quest to find a male friend. He’s a tall gangly guy with no discernable means of income, but he possesses a self-confidence that Peter lacks. This odd couple weirdly connects and they start hanging out together at Sidney's “man cave” where they share their love of the rock band Rush in jam sessions.

  3. Rashida Jones as Zooey Rice: Rashida Jones is the daughter of music mogul Quincy Jones and is a Harvard grad. She is an actress, writer and singer. She may be best known for her role as Karen Filippelli on the sitcom “The Office” as well as appearing in the hit film “The Social Network.” She also stars in the NBC sitcom “Parks and Recreation.” In this movie, she plays Peters fiancée who is initially supportive of his desire to find a guy friend to act as the best man at their wedding, but develops doubts after some embarrassing episodes with Peter’s new friend Sydney.

  4. Jon Favreau as Barry McLean: Favreau is a tremendously talented actor, writer and director. His first major role was in 1996’s “Swingers” with good friend Vince Vaughn (he also wrote the movie) and he’s been in comedies and dramas since then. He is also a director – he directed both “Iron Man” movies. However, he is best known for his comic roles. Coincidentally, like Jason Segal, he also appeared on “Friends” in season three as Monica’s boyfriend. As the husband of Denise, one of Zooey’s best friends, Favreau plays a jerk character here to full comedic effect. He’s hilarious as a guy who’s “forty pounds overweight with a Jewfro and a small dick” who has a real dislike for Peter. 

  5. Andy Samberg as Robbie Klaven: Samberg is a comedian, actor, writer and rapper. He is a cast member on Saturday Night Live where his Emmy-winning SNL Digital Shorts are wildly popular, many becoming internet phenomena. He attended NYU and majored in experimental film. Here he plays Peter’s younger gay brother who tries to give him advice on how to meet guys. An example of Robbie’s sage advice is when he tells Peter that “If you see a cool looking guy, strike up a conversation and ask him on a man date.” When Peter confesses that he doesn’t know what that means Robbie tells him, “Casual lunch or after work drinks. You're not taking these boys to see The Devil Wears Prada.”