Who Is This Brunette Cutie and Future Gossip Girl Star? (PHOTO)

Based on the mischief in that little girl’s eyes, you might have guessed it was Sofia Black-D’Elia, who plays Sage on Gossip Girl. Although her arm remains firmly around Nate (Chace Crawford) onscreen, Sofia has been using her talents to tweet up a storm off the telly — including the Spandex-alicious pic. The Skins vet is as free-talking and sassy online at @sblackdelia as she is onscreen.

Did you guess it was Sage? Have you grown to love her, or are you still wondering why Nate is making it with a minor? Sound off, y’all.

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