Just a few days after Heidi Klum’s ex, Seal, dressed up as Celtic Kevin Garnett for a Halloween party in Beverly Hills, a bunch of Boston celebs got creative with their own holiday getups. Sudbury native Chris Evans was spotted in a Hawaiian shirt at the Hollywood Forever Cemetery Halloween Party, which drew costumed celebrities such as Katy Perry and Emma Roberts. Harvard grads and twins Tyler and Cameron Winklevoss — portrayed by Armie Hammer in “The Social Network” — attended the Treats! Magazine Annual Halloween Party in Los Angeles with some recognizable faces, including Derek Hough and Mark Ballas from “Dancing With the Stars.” Newton native and horror master Eli Roth was joined by his mother, Cora, at his Las Vegas attraction, “Goretorium,” on Halloween night. And back at home, some of the Providence Bruins — including Max Sauve (the prince), Chris Bourque (Waldo), Matt Bartkowski (a crayon), and Jordan Caron (human tic-tac-toe board) — spent Halloween at Boston Children’s Hospital with patients and fans, including Alghalya.