George Clooney is Engaged!

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George Clooney is engaged! A reliable source close to the couple has confirmed to ET that the Oscar-winning star, 52, has proposed to his girlfriend, 36-year-old lawyer Amal Alamuddin. Read on for the romantic details!

On Thursday night, George and Amal were spotted having dinner at Nobu in Malibu, CA, with friend Cindy Crawford, and multiple sources confirm that they saw Amal showing off a ring to Cindy, the wife of Clooney's business partner Rande Gerber, sparking rumors of an engagement.

Security was notably tight at the restaurant Thursday night, and actor Edward Norton was reportedly with the group.

Earlier today, Clooney’s rep told ET, "I don’t comment on my client’s personal life."

RELATED: Cindy Crawford Reveals 'Shocking' George Clooney Bed Incident

George and Amal were first rumored to be dating in October 2013. As reported by ETonline last month, Clooney and Alamuddin showed some PDA snapped by photographers while on a private photographic and observational safari in Tanzania with a few friends.

So, when's the wedding? Stay tuned to ET for more breaking news...