Kristen Wiig co-wrote her own breakthrough role in last year's Bridesmaids.  The film is Universal's highest-grossing romantic comedy ever and naturally the studio would love to have a sequel.  However, Wiig tells THR, "We aren't working on that.  Annie [Mumolo] and I aren't planning a sequel. We are writing something else."  There's some speculation that Wiig and her co-stars were unhappy with the $100,000 bonus they received for the movie even though it ended up grossing $288 million worldwide.  Universal reportedly offered Wiig and eight-figure payday to return, but she declined the offer and now the studio is looking to hang the sequel on Bridesmaids' other breakout star, Melissa McCarthy.

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In addition to Wiig and Mumolo passing on the sequel, producer Judd Apatow may bow out as well.  A source tells THR, "I don't think [Judd] would proceed without Kristen and Annie's full participation."  Apatow released a statement explaining his hesitation:

"The key is we have to come up with an idea that is as good or better than the first one.  We don't want to do it unless it can be great. I don't think anyone has had the brain space to think about it yet. Hopefully that can begin this year."

The studio would obviously like to have a big R-rated comedy franchise on its hands like Warner Bros. does with The Hangover, and Universal has shown its willingness to move forward on sequels even if the lead actor won't return (Fast and Furious: Tokyo Drift, The Bourne Legacy).  There's also the possibility director Paul Feig would also pass on the sequel, so the only returning elements would probably be some or all of the supporting cast members.

For her part, Wiig is keeping with independent movies and she's set to star in passion project Imogene, the comedy Revenge for Jolly!, and Sean Penn's character-driven drama The Comedian co-starring Robert De Niro.