Country star Shania Twain insisted her sister and her horse were part of the show as she finalised the deal to perform a residency at Las Vegas' Caesar's Palace resort.

The curtain goes up on the Still The One singer's comeback shows on Saturday (01Dec12) and she'll have a very special guest onstage with her - her sister Carrie Ann Brown - while her favourite horse features in posters for the much-anticipated concerts.

Twain tells USA Today, "I'll have both up there with me. When I agreed to do this show, I said I will only do it if I'm surrounded by my favourite things, and I've stayed true to those wishes."

It's not clear if her horse will actually take to the stage but her little sister will be singing with her.

Twain adds, "I told her I wasn't doing this without her.

"We haven't been on stage together since I was 10 and she was eight. My records feature a lot of harmonising, and in past shows we hired someone to do that. But my sister sounds a lot like me, so it will sound more like the records than ever before."

And fans attending the comeback concerts will literally get a whiff of the smell of success - Twain and her artistic director have created a scent which will be wafted through the audience at show time. The fragrance, Still the One, will also be available after the show.