The actress and model, who's been dating the Oscar winner for two years, was 6000 miles away in Malibu, CA, enjoying the holiday weekend with friends.
The Mirror newspaper in the UK reports that the couple have not been seen in public together in three months.
"It's not like George and Stacy couldn't find time to get together if they really wanted to," an insider tells the Mirror. "George is quietly backing away from the relationship. It's always the same. As soon as he feels a woman is getting too close he pulls back."