Federline will appear in a multi-episode arc of the show, which returns midseason on the network.
His previous television appearances include an episode of "CSI," a guest spot on the NBC game show "1 vs. 100," and two episodes of "WWE RAW." He also appeared in the 2004 movie "You Got Served."
Federline's lawyer said last week that Spears' former assistant Shannon Funk was subpoenaed to give a deposition about a "matter related to the Britney Spears-Kevin Federline issue." The lawyer would not give any further details or confirm that her statement was in connection to a custody battle over the couple's two children.
Spears' bodyguard, another former assistant, and even the Promises Treatment Facility — where the pop star stayed for a month earlier this year — have reportedly all been served with papers.