Theron paid homage to MacLaine at last month's (SEP05) Premiere Icon party, and stunned guests when she stepped down from the stage to plant her lips on the actress' posterior.
A red-faced Theron later blamed her show-stopping tribute on the painkillers she was taking to combat an aching neck.
And during an appearance on Jay Leno's chat show last night,Theron got some of her own butt-kissing treatment, when fellow guest Cook stepped out and gushed, "I just want to let you know that I'm massive fan of yours. I mean, you're beautiful and you're talented... I know I'm kissing your a*s here, but..."
Theron immediately stood up and encouraged the funnyman to plant his lips on her derriere, prompting Leno to quip, "Why didn't I think of that?"