Britney Spears hit the town Sunday night for Elton John's Oscar party -- where she showed off her new brunette makeover!

The usually blonde star got all decked out for Sir Elton's annual affair, attending the bash in a gorgeous, tight and low-cut black gown that showed off plenty of cleavage.

But it's her hair that we can't get enough of!

Long gone were her fair locks (and sometimes messy roots). Instead, Brit Brit was rocking brunette hair ... and looking amazing, if we dare say so ourselves.

What do you think of her new look? Sound off below ... and check out more party pics above!

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