They could describe The Rock 's party-planning skills with one single word ... 'cause he threw his daughter a KATSEYE-themed bash for her 8th birthday -- and it was "gnarly!!!" The wrestling legend and actor pulled out all the stops for Tia 's big moment ... putting together a homemade cake featuring the pop group's songs and imagery -- even a sandwich from their hit music video. If the cake wasn't enough, they put up a big banner with the group's picture on it!! The girls were busy performing