Jimmy Iovine: So This Is Christmas ... Taylor Swift AND Penguins!

Jimmy Iovine knows how to throw a party ... the co-founder of Interscope Records moved the North Pole to his backyard on Sunday for his annual Christmas bash.

Partygoers tell TMZ Iovine went all out -- he rented penguins, real deal reindeer, and a sledding hill shaped with 2 tons of snow ... imported, of course. There was also a life-size gingerbread house where guests could build their own regular-sized-gingerbread houses.

Guests included Pharrell, will.i.am, and Gwen Stefani -- who showed up with Blake Shelton. Taylor Swift and Calvin Harris snapped a selfie with Jimmy's son, Jamie Iovine.

Yeah, your office party sucks.