CHARLIZE THERON & SEAN PENN ENGAGED & ADOPTING

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Charlize Theron is sporting a huge diamond sparkler worth as much as $100,000 after Sean Penn popped the question!

The Hollywood lovebirds “decided to take the relationship to the next level” while vacationing in Paris, sources told The National ENQUIRER.

Charlize’s halo-style engagement ring is “popular now among couples about to wed,” Joe Iannelli of Iannelli Diamonds in New York told The ENQUIRER.

He analyzed the 39-year-old Oscar winner’s ring in photographs and said: “The center stone looks like a four-carat round stone, surrounded by smaller diamonds.”

While the actress wears the ring on her right hand to avoid wedding talk, insiders said Sean, 53, has begun the process of adopting Charlize’s three-year-old son, Jackson, who already calls him “Daddy,” insiders said.

Meanwhile, sources said the couple is ironing out a prenup, although Sean – who’s divorced from Madonna and Robin Wright – didn’t want one. 

An insider revealed: “Sean’s got burned in the past, so Charlize’s insistence made him love her even more.”