Credit: Jeff Bottari/Getty Images Photo: Katy Perry and Markus Molinari Appear at 1OAK in Las Vegas

Katy Perry has been keeping a low-profile since she split with husband Russell Brand — but last night, when she made her first big public appearance at an event since the two announced their separation, she was all smiles.

Katy stepped out with her friend, jewelry designer and actor Markus Molinari, at the opening of 1Oak Las Vegas at the Mirage Hotel & Casino, sporting a dramatic black frock with bejeweled embellishments and electric blue hair. As far as we can tell, she looks like she's newly single and ready to tear up the town. 

According to TMZ, though, Katy kept it private at the event, never working the room, and staying guarded by security for the duration of the evening. Still, it's great to see our girl heading out for a fun night. 

Source: TMZ