"There's a brand of red-velvet cake, her mouth is made of that," Brand, 35, tells nextmovie.com. "She smashed you in the mouth [in] those kissing scenes.
The "Get Him to the Greek" actor, who wed songbird Katy Perry last year, goes on to suggest Garner's hubby might not be keen on her kisses.
Says the star, "If I were Ben Affleck, man, I'd be pissed off!"
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