Paris Hilton is enjoying the single life since splitting with Cy Waits last week. She hit up the HTC EVO 3D launch at the RadioShack Pop-Up Lounge in LA Thursday night, partying with David Arquette (who stayed sober), Zachary Levi, Jaime King, Brenda Song and others. Then she partied at Hollywood lounge Hemingway’s with best buds Allison Melnick and Jennifer Rovero. The social starlet stuck close to European DJ Tiesto, who performs at the Electric Daisy Carnival this weekend.