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51735636 New England Patriot star Rob Gronkowski celebrates his birthday at the Rehab Pool Party at the Hard Rock Hotel & Casino in Las Vegas, Nevada on May 9, 2015. Rob was celebrating a little early as his birthday isn't until May 14th. Linkin Park member Joseph Hahn was the special guest DJ. New England Patriot star Rob Gronkowski celebrates his birthday at the Rehab Pool Party at the Hard Rock Hotel & Casino in Las Vegas, Nevada on May 9, 2015. Rob was celebrating a little early as his birthday isn't until May 14th. Linkin Park member Joseph Hahn was the special guest DJ.

Pictured: Rob Gronkowski FameFlynet, Inc - Beverly Hills, CA, USA - +1 (310) 505-9876 JPVegas/FAMEFL;Photo Illustration by The Daily Beast
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