It's been a while since we've seen young power couple Miley Cyrus and Liam Hemsworth walk the red carpet together, but that changed on Sunday night, when the couple arrived at the CNN Heroes event arm-in-arm.

The event honored unsung heroes from across the United States who were presented awards by celebrities for their goodwill efforts. Cyrus was o- hand to perform at the event -- how cute is it that Liam came along to support her!?

Miley left littleto the imagination in her low-cut, cleavage-bearing, pale yellow Greek goddess-like gown, but I have to say, she is looking as gorgeous as ever. Love the cascading side-braid too.  I also can't help but swoon over Miley's arm candy, Hemsworth -- especially with that little bit of scruff he's got goin' on!

Liam Hemsworth and Miley Cyrus at CNN Heroes Event

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After walking the red carpet, Miley changed into a blue gown to perform her 2009 hit The Climb.  It's been a while since we've seen Miley do anything music-related, so it's good to see that she's still got it -- especially when it's for a great cause like this one! Check out the vid of Miley's performance!:

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What do you think of Miley's red carpet look!? Wat too risque or totally glam?