"No comment," Stone's publicist told UsMagazine.com when asked if the couple had ended their romance.
Stone, 54, and Mica, 27, have been dating for about eight months.
Stone is best known for her work in the film "Basic Instinct." She has been divorced twice and has three sons.
Trader Joe's: Car crashes into Long Island store, injuring 11
Ukrainian protestors topple Lenin statue [VIDEO]