Chelsea Handler is "too busy" to star in her own sitcom.

The 36-year-old chat show host's new NBC series 'Where Are You, Chelsea?' premieres tomorrow night (11.01.12), and while she has taken up a small role as her sister, actress Laura Prepon plays the leading part as the outspoken star doesn't have time to commit to the show.

Chelsea - who hosts E!'s 'Chelsea Lately' - explained: "I don't have time to star in my own TV show. If I did, I would."

However, she is enjoying taking on the role of a person with a "completely different attitude" to her in the series, which is based loosely on Chelsea's three books.

Chelsea added: "It's fun to just kind of dress shlumpy and have a completely different appearance and have a completely different attitude.

"It's nice to play against someone who's playing me. It's very antithetical to Chelsea. So it's kind of a really fun role."