Selena Gomez tour 2013 opening act always starts with the dancing. Selena Gomez practices the choreography until it is seamless and done to perfection.

Selena Gomes told MTV News, “I think the dancing is what I'm most nervous about because I'm such a perfectionist.”

Selena Gomez has been working for two months to perfect the Stars Dance World Tour. Selana Gomez’s rehearsals lasted about eight hours a day. The sultry pop singer and former Justin Bieber squeeze learned many different styles of dance. Selena Gomez is working with choreographers Fatima Robinson and Charm, who worked with A-list artists like The Black Eyed. The two choreographers say their favorite numbers are "Whiplash" and "B.E.A.T."

Selena Gomez’ Star Dance World Tour kicks off tomorrow. It is a 56-city tour that has stops around world. The show will be a lot of work and all the kinks have been worked out after two months of rehearsal as far as the music, the wardrobe changes and the lighting. But Selena Gomez is still nervous about opening night.

The “Come and Get It” singer was at final dress rehearsal at Citizen's Bank Arena in Ontario, California and said, "I think the dancing is what I'm most nervous about because I'm such a perfectionist. And two of my best friends are actually on that stage with me that are dancers and have been dancing for years so I want to keep up with them and that's been something that's been challenging. It's great and I feel like I've been working out, which I feel I need to do more of.”

Choreographer Fatima Robinson said "I think the moves have really just grown with the way her music has grown. We're just trying to keep up with the times and make her music, like with all artists, make them grow along with their music and she's definitely, definitely had growth with this album."

The two choreographers, Charm and Robinson, say that Selena Gomez is a hands-on artist. Robinson said "I think the main thing is she has definitely gotten out of the box on this tour and she's been more involved in what the content looks like, what the lighting looks like, what the music is going to sound like," Robinson said. "You know she's picked covers, really great covers. When you come see the show you'll be very surprised to hear her sing some of the songs she's going to sing. Her voice is so amazing on some of these songs. Even I was in shock on how amazing this girl's voice.”