"These three shows are clearly resonating with audiences as evidenced by their steady growth," Nevins said in a statement. "We are extremely pleased with the creative work being done by the casts, producers and writers -- and I so appreciate that each of these series has such a clear and distinctive voice."
"Shameless" Season 3, "House of Lies" Season 2 and "Californication" Season 6 will begin shooting later in 2012. All three shows air as part of Showtime's Sunday night block of programming.
According to Showtime, "Shameless," which stars William H. Macy and Emmy Rossum, averages 4.75 million viewers including On Demand, reruns and DVR viewing. It's up 30 percent compared to its first season. The debut season of "House of Lies," which boasts Kristen Bell and Don Cheadle, has been averaging 3.98 million viewers across various platforms. Season 5 of "Californication," led by David Duchovny, averages 2.96 million viewers, up 10 percent from last season.