Singer Katy Perry arrives to celebrate the grand opening of 1 OAK Las Vegas and the GiveLove charity event at 1 OAK at the Mirage Hotel & Casino on January 27, 2012 in Las Vegas, Nevada.
(January 26, 2012 - Source: Jeff Bottari/Getty Images North America) see more angles »

Katy Perry B.o.B

Katy Perry wore her blue classic bob sleek and straight at the opening of 1 Oak in Las Vegas.
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