Do I Bring A Stranger A Gift At Joint Bday Party?

Leo and Rebecca BUZZ QUESTION...One of my besties is having a JOINT BIRTHDAY PARTY with another girl I don't know. Anyways, my bestie invited me to the party and asked that I bring the OTHER GIRL A GIFT AS WELL. WTH??? Who does that? I don't know her! I told her she was cray but she said that they are asking everyone to do this. WHAT WOULD YOU DO? smh