Hmm, I never heard of Burlesque before, but I'm actually pretty excited about it. Definitely gonna check it out, and I love when Xtina puts her voice in front of her attitude.
And by the way, I think I agree with ibelong2me, I've seen some interviews and shows with her, I don't find she has that much attitude. For sure, some songs on Bionic sounds really bitchy, but everyone feels bitchy once in a while.
She just had her baby, she's filling her mom's role, and needed to feel like a young promiscuous girl again ;)
This Xtina clip also reminds me of Fergie's clip in Nine. I was totally blown away. I mean, I never thought this girl could sing that way (while maintaining the accent ;) ) Look it out !