United Kingdom, Feb. 15 -- Reese Witherspoon thinks Will Ferrell is a "comedy genius".

The 48-year-old actress admitted starring opposite Will, 57, in 'You're Cordially Invited' was a "bucket list" moment for her and Reese couldn't have turned down the opportunity to work with the comedy star.

Reese told Britain's HELLO! magazine: "I loved the script, and then of course I got to work with Will Ferrell. How could I say no?

"It felt like a real bucket list moment for me, because I have been a Will Ferrell fan forever.

"It had been 25 years since we did a sketch together [on 'Saturday Night Live'], so we did do camera tests, but it's just so easy with Will. He's so easy to work with, so generous; I loved working with him.

"The man is a ...