The actress currently plays twin sisters Bridget and Siobhan on new CW drama Ringer.
"The whole duality [of the show] is so interesting, because everybody is one way at work and... one way [when they're] at home," she suggested on The Rachael Ray Show.
"And being twins... could you imagine someone who looked exactly like you? I think that's creepy actually."
The series premiere of Ringer led The CW to its best Tuesday night performance in over two years, attracting 2.7m viewers.
Former Buffy star Gellar recently claimed that she has no regrets about returning to television, insisting that the medium has the best roles for women.
Ringer continues on Tuesdays at 9/8c on The CW.
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Watch Sarah Michelle Gellar chat to Rachael Ray below: