Rimes and Cibrian, who co-starred in the film Northern Lights and also sparked rumours of an affair last March, were seen together on a golf course in Valencia, California, reports FemaleFirst.
According to sources, the two stars seemed to be quite relaxed and at ease with each other. They spent the day riding around in a golf cart, conversing and hugging.
Last Saturday (August 22), the couple was spotted at the Kings of Leon concert in Los Angeles.
Although she categorically denies that she had been unfaithful, Rimes and her husband of seven years, Dean Sheremet, separated last month.
Cibrian also split from his wife, Brandi Glanville, with whom he has two children.