Wanna feel old?Courteney Cox and David Arquette's little baby is all grown up and...going to her first formal dance.

The 55-year-old Friends alum posted on her Instagram page on Saturday night a photo of her and her ex's 15-year-old daughter Coco Arquette, their only child together, sporting a low-cut, sleeveless red ruched mini dress. She also shared alongside the pic a black and white image of herself posing in a white dress over a black mock turtleneck and carrying a bouquet of flowers.