Stephen Colletti and Lauren Conrad attended a party together for Hornitos Tequila at Hollywood hotspot Opera Thursday night, September 20.

"Stephen and Lauren definitely looked like an item, " a source tells Star. "They hung out together the entire time and at one point, Stephen grabbed Lauren and took her out to the dance floor, where they danced to the song 'One More Time. ' They were laughing and flirting. They looked really happy and cute together."

Stephen and Lauren dated while on the hit show Laguna Beach.