The 52-year-old superstar recently popped the question to girlfriend Amal Alamuddin, a source close to the couple has confirmed to People magazine.
"George and Amal are trying to keep things very low-key but they also aren't really trying to hide this, it doesn't seem. I think it's like they want the people they love to know that this is real, that they plan on being together forever," the source told the mag.
On Thursday, Clooney and his 36-year-old lady love, a British attorney who specializes in international law and human rights, were spotted dining at trendy eatery Nobu in Malibu, alongside Cindy Crawford and husband Rande Gerber, a longtime friend of Clooney's. Engagement rumors flew after witnesses at the restaurant noted that Alamaddin was wearing quite the diamond sparkler on her ring finger.
On Friday, a rep for the actor addressed the rumor mill, saying, "I don't comment on my client's personal life."
The duo first made headlines when they were spotted out and about in London last October. Since then, the globe-trotting twosome have been on several romantic spots. In March, America's most eligible bachelor and the lady lawyer went on a safari to Tanzania. They also went on a more low-key vacation to the Seychelles.
The former "E.R." actor has had many high-profile romances, including ones with Stacy Keibler, Kelly Preston, Renee Zellwegger and Elisabetta Canalis, during his decades in the limelight. In addition to those relationships, the "Gravity" star was also married to actress Talia Balsam from 1989-1993.