Halsey & Camila Cabello Step Out for Taylor Swift's Birthday!

Halsey and Camila Cabello head to Oscar Wilde restaurant to help their friend Taylor Swift celebrate her birthday on Friday night (December 13) in New York City.

The two singers both performed at Z100′s Jingle Ball that evening and they left right after their sets so that they could party the night away with Taylor.

A bunch of stars were in attendance at the holiday themed event and Camila even left with a Santa hat on her head!

You can check out photos of Halsey performing at Jingle Ball in the gallery.

FYI: Camila is wearing a La Perla bra, top and pants.