Lewis started off the party at Paramount Studios by singing 'Bleeding Love" and 'Outta My Head", and thanking the blogger for his support, while rapper Eve and Minnelli also performed. The highlight of the circus-themed event came after a montage of video tributes from the likes of Kylie Minogue and Lady Gaga.
Then scantily clad Perry, 25, arrived, singing Happy Birthday, while sitting on the elephant.
London (ANI): Singer Katy Perry is said to have surprised celebrity blogger Perez Hilton when she arrived at his birthday party on an elephant. The party, held on March 27 to celebrate Hilton"s 32nd birthday, saw a host of other stars, including Melanie Brown, Lindsay Lohan, Paula Abdul, Liza Minnelli, Justin Bieber and Leona Lewis, reports the Daily Star.