[Katy Perry, Marcus Molinari, event guests. All photos by ANDREAS BRANCH for PMc] Stars of the big screen, small screen, and computer screen turned out in droves as self-proclaimed "film maker, actor, host, socialite, [and] student of life" Markus Molinari celebrated his birthday at h.wood last night. Molinari, who may be most recognizable for his YouTube performance of Beyonce's "Single Ladies (Put a Ring on It)" celebrated in style with BFF Katy Perry, and other guests including.... Perez Hilton, Tatyana Ali, Leven Rambin, Matt Dallas, and American Idol contestant David Hernandez.

DJ Mia Moretti                                        Perez Hilton

Tatyana Ali                                             David Hernandez

Jonathan Sadowski                                 Leven Rambin

Mondo Fresco                                          Zelda Williams