Britney Spears -- My Finger is $90,000 Lighter

Conservatorship wonder Britney Spears is finally free ... of her $90K engagement bling.

For the first time since breaking it off with her ex-fiance Jason Trawick, the newly single pop diva was spotted in L.A. this weekend minus the huge Neil Lane 3.5 carat rock.

As TMZ previously reported, Jason didn't have to ask for the pricey bauble back as Britney returned it all on her own.

With her lucrative Vegas deal in the works, she can buy a new rock whenever she wants.