Shania Twain kicked off her first-ever "Shania: Still the One" headlining gig Saturday night at the Colosseum at Caesars Palace in Las Vegas, Nev. where she'll be performing for two years. "Thank you," she told the crowd, "Thank you so much ... you guys are going to get me all emotional, and then my eyelashes are going to fall off! The concert aimed to show concert-goers a more personal side of Shania as well. Inviting her younger sister Carrie Ann on-stage, the two shared their first public duet since they were young teens.