Ireland Baldwin Celebrates 21st Birthday Early With Costume Party

This is how you celebrate your birthday when it’s around Halloween time!

Ireland Baldwin dressed up for a costume party to ring in her birthday week — she turns 21 TODAY!

The model and eldest daughter of Alec Baldwin and Kim Bassinger, headed to the On The Rox club in her costume — a barmaid-like one who was bitten by a vampire!

PHOTOS: Check out the latest pics of Ireland Baldwin

With Halloween season upon us, we still have to find a good costume! What do you think we should go as? Any ideas?

TELL JJJ: What are you going as for Halloween?