The "Deadpool" actor starred in a sketch on Saturday alongside Jost, who is a regular cast member on the show.
In the sketch, actor Alex Moffat played "a guy who just bought a boat" with Reynolds portrayed as "a guy who knows the owner". The funny segment ended with Jost calling the men his "two best friends".
Reynolds and Johansson were married from 2008 to 2011. He is now married to actress Blake Lively and the couple shares three daughters.
The "Avengers: Endgame" star and Jost became engaged in May (2019).