OK, not Shaw, but Brandon Routh is co-starring in a new series premiering tonight. Partners debuts on CBS at 8:30/7:30 as one half of a gay couple. Michael Urie plays his partner, David Krumholtz plays Urie’s straight best friend, and Sophia Bush plays Krumholtz’s fiancee. Clear as mud? In essence, this is a sitcom about a pair of best friends – one gay, one straight – and how they handle each other being in significant relationships.