A close pal of the former WWE wrestler, 33, told People magazine that Keibler called it quits, as she wants to have children and a family some day and knows where Clooney stands on that, the Mirror reported.
The insider asserted that the duo has talked and they quietly stopped being a couple several weeks ago.
Just last week, the Hollywood star was spotted on a boat with friends in Lake Como, Italy, while Keibler was 6,000 miles away in Malibu, California.
32 photos from Sidharth Malhotra's Instagram album you must see
In pictures: 'Centurion' Virat Kohli and the art of chasing
Spotted: Sushant Singh Rajput at Kriti Sanon's house in Mumbai
Photos: 'Yeh Hai Mohabbatein' actress Karishma Sharma strips for shoot
Photos: Celebrities at Mumbai Marathon 2017