media_removed_toofab 102011

Carey Mulligan hasn't confirmed whether she's engaged to Mumford and Sons' singer Marcus Mumford -- but that sparkler on her ring finger may have done it for her.

The cute 26-year-old star of "Drive" was spotted at Sydney Airport yesterday with an impressive circular stone on her left hand, seeming to validate rumors that Mumford recently popped the question.

The couple, who reportedly got engaged in August after dating for five months, are childhood friends.

Click the gallery above to see more wedding and engagement bling!

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