Britney Spears: Rocking Engagement Ring! Still Not Engaged to Jason Trawick!

If we've learned anything over the years, it's that Britney Spears occasionally loves wearing huge, diamond jewelery on her left ring finger.
But that doesn't mean she's engaged people! Geez!
The singer fueled the semi-annual Jason Trawick engagement rumors Friday when she stepped out in London with a HUGE ROCK! Peep it:
Britney Waves
Spears flaunts a giant ring and gets the rumor mill buzzing at BBC Radio 1.
Look at that BLING! Although the two denied reports that Jason Trawick was planning to propose to the pop queen (again), you have to wonder if he will.
It's been a long, serious relationship at this stage, and if anyone's familiar with her very complicated past and present life situation, it's her former agent.
Not yet, though. Upon closer inspection, while the ring is clearly mammoth and no doubt expensive as heck, it's not an engagement ring. We don't think. Look:

Britney Spears' New Engagement Ring?
Britney Spears wouldn't rock a yellow engagement ring, right?