Question: The Nickelodeon Australian Kids' Choice Awards 2008 were hosted by what American professional wrestler who started his professional wrestling career in 1999 with Ultimate Pro Wrestling?

<P0-S0> The 6th annual Nickelodeon Australian Kids' Choice Awards were held on 11 October 2008 at the Hisense Arena in Melbourne. <P0-S1>  John Cena has been picked to host the Nickelodeon Kids Choice Awards alongside Natalie Bassingthwaighte. <SEP> <P1-S0> Keisuke Yamada (山田 圭介 , Yamada Keisuke , born July 6, 1974) is a Japanese professional wrestler, better known by the ring name Black Buffalo (ブラックバファロー , Burakku Bafarō ) . <P1-S1>  Originally starting his career in International Wrestling Association of Japan, where he worked under his real name, Yamada found a new home promotion in 1999 in Osaka Pro Wrestling, where he began wrestling under a mask and the ring name Black Buffalo. <P1-S2>  For most of his career in Osaka Pro, Yamada has portrayed a villainous character, having been a part of every major villainous alliance in the history of the promotion. <P1-S3>  During his first years in the promotion, Buffalo went on to become a four-time Tag Team Champion. <P1-S4>  In February 2008, Buffalo was forced to unmask and reveal his true identity, after losing a match, and afterwards began teaming with the man, who unmasked him, Tigers Mask, with two becoming two-time Osaka Pro Wrestling Tag Team Champions together. <P1-S5>  Finally, in March 2012, Buffalo managed to win Osaka Pro's top title, the Osaka Pro Wrestling Championship. <P1-S6>  Backstage, Yamada served as the vice president of Osaka Pro Wrestling. <P1-S7>  Yamada left Osaka Pro Wrestling after the promotion went through a corporate restructuring in April 2014, shortening his ring name to Buffalo (バッファロー , Baffarō ) . <SEP> <P2-S0>  He is currently signed to WWE, where he is a free agent, appearing for both the Raw and SmackDown brands. <P2-S1> John Felix Anthony Cena ( ; born April 23, 1977) is an American professional wrestler, rapper, actor, and reality television show host. <P2-S2>  Cena started his professional wrestling career in 1999 with Ultimate Pro Wrestling (UPW) and won the UPW Heavyweight Championship the following year. <P2-S3>  Cena signed a developmental contract with the World Wrestling Federation (WWF, later renamed to World Wrestling Entertainment, or simply WWE) in 2001, debuting on the WWE main roster in 2002. <SEP> <P3-S0> Mio Shirai (紫雷 美央 , Shirai Mio , born February 14, 1988) is a Japanese former professional wrestler and current professional wrestling referee. <P3-S1>  She started her career in March 2007, working alongside her sister Io Shirai on the Japanese independent circuit for promotions such as Ice Ribbon, JWP Joshi Puroresu and Pro Wrestling Wave. <P3-S2>  In June 2010, the Shirais came together with fellow freelancer Kana to form the Triple Tails stable as part of which they began working most notably for Smash. <P3-S3>  After Io left the stable the following year, Mio and Kana continued working together as the tag team Triple Tails.S. <P3-S4>  Shirai remained a freelancer until January 2014, when she signed a four-way contract with Ice Ribbon, Oz Academy, Pro Wrestling Wave and Union Pro Wrestling. <P3-S5>  She retired from professional wrestling due to neck injuries in September 2015 at the age of 27, after which she started working as a referee.