Anna Chlumsky
had everyone crying 20 years ago when "My Girl" came out in 1991 -- but last night, she hit the red carpet looking red hot!

Chlumsky, who played "Vada Sultenfuss" alongside a young Macaulay Culkin in the tearjerker flick, was spotted at the premiere of Oscar-bait "The Iron Lady," looking gorgeous in a red dress and black heels.

Both Anna and Macaulay have been M.I.A. from the limelight recently -- with Culkin's last public appearance being an Oscar tribute to John Hughes in 2010.

Check out the gallery above to see what some of your other favorite child stars look like now!

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