Haters gonna hate.

Melanie Griffith knows this all too well. Posing for photographs at the Oct. 20 Children's Hospital of Los Angeles Gala: Noche de Ninos, the Oscar-nominated star looked slim and sexy in a strapless, curve-hugging floral gown by Dolce & Gabbana, with Miu Miu platform sandals, red lips, and a tousled up-do.

PHOTOS: Hollywood families

But it seems not everyone thinks the 55-year-old blonde is aging well. Us Weekly caught up with Griffith on the red carpet, where she revealed that folks on Twitter have had some not-so-nice things to say about her appearance of late.

"Most people are telling me I look horrible," the Working Girl actress told Us. "The tweets I get are really nasty."

PHOTOS: Ageless A-listers

Still, the star -- whose daughter Dakota Johnson stars in the new Fox sitcom Ben & Kate -- appeared to be in good spirits all night. She worked the room like a pro, smiling and laughing as she chatted with husband Antonio Banderas, pal Jamie Lee Curtis, and supermodel Heidi Klum, who received a "Courage to Care" award from the hospital.

PHOTOS: Dakota and other rising stars

So what's the secret to Griffith's composure in the face of criticism? Modesty. And exercise.

"I don't know if I look that great," she demurred. "[But] I work out a lot. I have a trainer that I [work with] four times a week, and I do hot yoga."

This article originally appeared on Usmagazine.com: Melanie Griffith: People Tell Me "I Look Horrible"