"The Voice" came back stronger than ever last night -- with a svelte Christina Aguilera and the rest of the gang belting out an impressive cover of "I Love Rock 'n' Roll."

With a her powerhouse pipes, sexy, skin-tight dress and some sultry dance moves with CeeLo Green, Aguilera definitely stole the opening number, which marked her return to the series after a season off.

And, is it just us, or did she seem like an overall nicer person all episode long? Like she didn't just lose weight, but also some of her bitterness.

It was definitely a great start for the series, which just picked up an Emmy for Outstanding Reality-Competition Program on Sunday night.

But we gotta ask the age-old question: Britney or Christina?

Who did it better? Sound off below!

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