Britney Spears really fueled fire to the Jason Trawick engagement rumors yesterday -- when she stepped out in London with a HUGE rock on her ring ringer!

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Though the two denied reports Trawick was planning to propose to the singing superstar, Spears flaunted a giant yellow rock while arriving at BBC Radio 1 on Thursday.

We wouldn't call this a confirmation of an engagement though, as Britney has a history of wearing jewelry on her ring finger.

Get a closer look at the ring above!

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