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"Bradley Cooper has praised his monkey co-star on The Hangover Part II.  The Limitless actor spoke to the Toronto Sun about the primate, who plays a drug mule in the highly-anticipated sequel to 2009&amp;#039;s The Hangover.  &amp;quot;Crystal was incredible,&amp;quot; Cooper said of the monkey. &amp;quot;I&amp;#039;d actually worked with her on Failure to Launch about six years ago.&amp;quot; The 36-year-old actor continued: &amp;quot;What&amp;#039;s it say that I&amp;#039;m doing movies with monkeys I&amp;#039;ve worked with before? Is it my age?&amp;quot;.  Cooper recently admitted that he was shocked by how his co-star Ed Helms reacted to being naked in the forthcoming sequel.  Director Todd Phillips has also said that a third and final Hangover movie may be in the works.  The Hangover Part II opens in cinemas in the US and the UK on May 26.  Watch the trailer for The Hangover Part II below:   "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/movies/the-hangover/news/a320926/bradley-cooper-hangover-monkey-was-incredible/>