People first reported about the proposal when the couple was vacationing at South Africa’s Kruger National Park.
Kimmel, 44, started dating McNearney, 34, in 2009, who is also one of the head writer’s of the show.
The nuptials will take Kimmel down the aisle for the second time.
Meanwhile, Kimmel is all set to host the Primetime Emmy Awards this year on September 23. The awards ceremony will take place at Nokia Theatre in Los Angeles.