Pop singer/actress Christina Milian -- noticeably not wearing her wedding ring -- enjoyed a girl's night out with pal Serena Williams Monday night in Los Angeles, and Breaking Celebrity News has the new shots of the suddenly single star.

The Dip It Low singer, 28 - who recently split from her husband, music producer Terius 'The Dream' Nash - went clubbing with the tennis ace at Angels & Demons, a Hollywood hotspot.