michael ealy gi 320 USA picks up 'Common Law'; '90210' casts a 'cowboy'Today’s TV snacks include a new series getting greenlit, an existing show coming back for a second season and a couple pieces of casting news.

USA has given the green light to a buddy-cop series called “Common Law.” It stars Michael Ealy (“The Good Wife”) and Warren Kole (“The Chicago Code”) as LAPD detectives who hate each other so much that their captain (Jack McGee, “Rescue Me”) sends them to couples counseling. Wacky! [USA]

The CW has added two new characters to “90210” for its fourth season. Justin Deeley (“Couples Retreat”) will play a “cowboy type” — actually the son of a country-music star — who’s a potential love interest for Naomi (AnnaLynne McCord), while Megalyn Echikunwoke (“CSI: Miami”) will play a rival of Naomi’s at college. [TVLine]

Meet the new governor on “Hawaii Five-0”: Richard T. Jones (“Terminator: The Sarah Connor Chronicles”) will have a recurring part on the CBS series this season. His character will keep a tighter rein on the Five-0 team than the previous, pushing-her-own-agenda governor (Jean Smart) did. [TV Guide]

A&E has picked up its drama “Breakout Kings” for a second season. The show, which began life as a FOX pilot before migrating to cable, will go back into production later this year and likely return in early 2012. [A&E]

HBO has begun development on a series based on Carl Hiaasen‘s novel “Skinny Dip,” about a low-life scientist, the wife he tries to murder and an ex-cop who helps her. Michael Oates Palmer (“Rubicon”) is writing the script and exec producing with actor Michael Keaton, who has a development deal at HBO. [Variety]