Lauren Sanchez wears the new 'Mrs. B' Bling at dinner with her fiancé Jeff Bezos

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Do path For Mrs. B! Lauren Sanchez was out For dinner has Nobu In Malibu with her billionaire fiance Jeff Bezos And friends Wednesday ... swing A breathtaking new piece of bling.

THE ancient TV the anchor 20 carats engagement ring -- would have value $2.5 million -- clearly is not it enough has cement their on hold union ... as She took A subtle "Mrs. B" gold necklace out For A turn.

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If THE “B” symbolizes “Bezos” Or "billionaire" remains A mystery ... but A things For Of course, THE chain was putting all to focus on her turning ... completing her plunging all Black look And lined with pink coat.

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Lauren East clearly magnet each moment of their engagement ... earlier This month She laid For A western themed propagated with Jeff, And said THE fashion Bible they do not have do any of them progress with marriage planning again.