Sam Hennings, Robyn Lively and Leonard Howze (pictured) have been tapped to join Jason Lee in the upcoming TNT pilot 'Delta Blues,' from executive producer George Clooney.

According to the Hollywood Reporter, 'Blues' follows Dwight Hendricks (Lee), who who spends his Memphis days on the police force and his nights impersonating Elvis Presley.

Hennings, who will play Whitehead, Dwight's partner on the force, has appeared in numerous movie and television roles, most notably 'CSI,' 'Dollhouse,' 'The Aviator,' 'Havoc,' starring Anne Hathaway, and the Hallmark Channel's 'Elevator Girl.'

If I didn't love this news so much, I'd be worried that 30 Rock was turning into The Love Boat or Will and Grace. After all, it seems as though there's news of a new guest star every few days. First Will Arnett signed on to reprise his role as the delightfully evil Devon Banks, then ex-Friend, Jennifer Aniston, decided to return to television in order to stalk Jack Donaghy. After that came news that Oprah was scheduled to play herself on an upcoming episode.

That's a lot of guest stars to pack into one season, but now we have news of two more. Everybody's favorite Gossip Girls, Blair and Serena, AKA Leighton Meester and Blake Lively, are coming to 30 Rock. What on earth could bring these Upper East Siders to Midtown? Are they trying to overthrow Liz Lemon as queen bee of TGS with Tracy Jordan? Are they starring in a movie with Tracy Jordan? There's more info on their storyline after the jump.