Clay Aiken and his son
Parker Aiken, 9 months, visit an office building on Wednesday (May 13) in Beverly Hills, Calif.
The 30-year-old former
American Idol contestant will be making his cameo on
30 Rock's season finale, where Jack (
Alec Baldwin) builds a relationship with his estranged father. The episode ("Kidney Now!") airs TOMORROW, May 14 @ 9:30PM ET/PT on NBC. Also making guest-starring appearances: