Those are certainly from scammers to get your account details to swindle your prize.
You absolutely shouldn't put your email and password in that link that obviously not from freebitco.in.
Also, they will not ask you to deposit any BTC to claim it (did you just logged-in to a fake freebitco.in page?)

If you already did logged in to that scammer's site, PM TheQuin immediately about it so that he wont accidentally send it to them.
Don't rush it, double-check any link you've been receiving and think twice before logging-in.

By posting that "you've won a lambo", you're instantly became a target by hackers, please exercise extreme caution.