Chrissy Teigen dresses in fireman uniform to celebrate McDonald’s new delivery system

She sets many a heart aflame.

And Chrissy Tiegen continued to heat things up as she celebrated the McDelivery launch with the Hoboken Fire Department on Tuesday.

The 31-year-old supermodel joined in the fun by donning a fireman’s uniform for the unique day honoring the fast food chain’s new delivery system.