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Obviously Reese wouldn't want anything to happen to her 4 carat, $250,000 engagement ring from fiance Jim Toth, so it's no surprise she's got a death grip on that thing as she jogs through her Brentwood neighborhood Saturday morning.

Toth proposed with the rare Ashoka diamond to his A-list girlfriend of about a year over the holidays.

Since then, Reese has been reticent to take the ring off, even for her workouts, where she at least turned it around to keep a hold on it!

And with a ring that special, we can't blame her!