Ariel Winter, 19, bares cleavage in sexy, ultra-revealing outfit -- as rest of 'Modern Family' cast wears jeans

Ariel Winter is never shy about flaunting her curvaceous figure, but this look is a bit puzzling.

The 19-year-old "Modern Family" star joined her fellow cast members at an ABC screening this week, and she was definitely ready for her closeup: Her ultra-revealing metallic mini bared not only her ample cleavage, but also as much leg as humanly possible. Featuring large cutouts and mesh overlay, the bold number was a showstopper -- but made absolutely no sense at the event!

See for yourself: While Ariel looks like she's headed to the Grammys, the rest of the cast is rocking casual pants and relaxed weekend shirts. (9-year-old Aubrey Anderson-Emmons did wear a dress, but they're not exactly comparable.)

Ariel paired the glitzy number with pointed gold stilettos and bronzy eye makeup. Meanwhile, co-star Julie Bowen opted for a low ponytail and sleeveless top, and all the leading men rocked jeans.

During the panel discussion, Ariel effectively avoided a wardrobe malfunction even while seated on stage -- but we have to say, it doesn't exactly look comfortable!

Boyfriend Levi Meaden was also in attendance (pictured in gallery above). The two were spotted kissing in April at Coachella, where Ariel rocked an underboob-heavy crop top.

See Ariel Winter's sexiest Instagrams