As "The Hangover III" hits theaters, where we're likely to see another Mike Tyson cameo, take a look at some other celebrities who have made memorable cameos on the big screen.
Mike Tyson – "The Hangover"
Pop singer Katy Perry has made a big impact on the music scene in the few years she has been around. In celebration of her 30th birthday on Saturday, join us for a look at her career so far.
Robin Williams' daughter chose a hummingbird to honor her late father.
As she stars in "White Bird in a Blizzard" take a closer look at Shailene Woodley.
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