The couple have apparently confirmed that they've called it quits after two years together - and it's all down to the reason you already guessed....
Stacy is said to be the one who ended things after - surprise, surprise - deciding she wants babies.
[ Zara Phillips is pregnant with her FIRST baby ]
A source confirmed to People: "Stacy called it quits. She wants to have children and a family someday.
"She knows where George stands on that. They talked and they quietly stopped being a couple several weeks ago."
And while they will no longer be swapping spit, both George, 52, and Stacy, 33, want to make sure they remain close pals.
The source added: "They talk every day. They were friends before they started dating and they'll be friends after. It was a friendly [breakup]."
The pair have not been spotted together since March, sparking rumours that there could be trouble in paradise.
The source reckons Stacy and George started "growing apart" earlier this year, with Stacy insisting she has an incredibly busy schedule lined up for the rest of the year.
Don't pretend you're not feeling secretly smug about this, we've all got our happy faces on right now.