Are Sean Penn and Charlize Theron Engaged?

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You gotta be careful which finger you choose to show off some jewelry!

Rumors are swirling that Sean Penn popped the question after Charlize Theron stepped out at LAX with some very sparkly bling on thatfinger at LAX on Wednesday, July 3.

Is this really the ring the couple would choose?

The accessory in question is an 18-carat Anita Ko, yellow gold leaf ring that retails for $4,900. Though it's gorgeous, it of course led to speculation that the 53-year-old actor proposed. However, it's also just as likely that the 38-year-old actress purchased the ring herself.

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Though the accessory does raise some eyebrows, it wasn't too long ago that Theron said she was in no rush to wed. "I never had the dream of the white dress," she told Vogue magazine in May.

Theron and Penn have been dating since Jan. of this year, but do you think they are engaged? Or is she just rocking a pretty ring?