According to the National Enquirer, Dexter star Michael C. Hall is secretly dating his onscreen sister Jennifer Carpenter.
Hall plays the forensic expert who secretly murders serial killers. Carpenter plays his adopted sister. They've been dating for almost a year now, after Hall separated from wife Amy Spangler.
The couple has even moved in together. The network which makes the show, Showtime, is by all accounts not too happy about the arrangement.