Photos courtesy of Chris Weeks/Wire Image

Halloween is Heidi Klum's favorite holiday -- and she makes sure everyone knows it!

This year, for her 13th annual bash, the supermodel celebrated at Tao in Las Vegas ... and her costume was appropriately gory!

Klum told reporters at the event on Saturday night that it took almost four hours to apply the makeup for her dead body costume. She arrived on a gurney, covered by a sheet. She said:

    "In our house it's Halloween all year round. It's not as scary but (my kids) love dressing up. Look at their mom. She's always dressing up. It runs in the family."

Klum is married to singer Seal -- they have four kids. But her little ones certainly weren't at the Las Vegas bash, at which Klum danced until almost 4 a.m.!

See more pics of Heidi, plus find out what other celebs attended her famous fete after the jump!