For once it's not Sofia Vergara's cleavage stealing the show ... but one of her "Modern Family" costars!

Sarah Hyland was busting out on the red carpet Sunday night at the Golden Globe Awards in Los Angeles, where she wore a gorgeous black Max Azria Atelier gown.

The 22-year-old actress looked more grown up than usual, sporting some sexy long locks for the event as well.

While she looked gorgeous tonight, it was a different story this morning.

"Don't you love it when you wake up with hives all over your face? #morningoftheglobes," she tweeted early Sunday.

Luckily they cleared up! What do you think of Sarah's more adult look? Sound off below!

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