It was the subtle yet cheeky moment that disrupted the inane banter of the red carpet, if only for a second.
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Cake star Jennifer Aniston had just disposed with the obligatory "who are you wearing" question from perennial red-carpet lurker Ryan Seacrest, when a passing hand gave her Versace-clad butt a bit of attention.
Aniston was just about to relay a childhood memory involving a tricycle plunging into a swimming pool, when Reese Witherspoon glided past and pinched the Friends alum on the bottom.
Aniston gasped in surprise, before identifying the culprit as the Wild star.
 
"Oh, hi, honey," she said, as Witherspoon flicked her a wave before disappearing down the carpet.
Seacrest, on the other hand, seized upon the moment.
"There was a grab! There was a grab! Here we are in a serious moment and I saw a grab."
Raising her hands in the air, Aniston proclaimed her innocence.
"I didn't do it. So sorry."
Fairfax Media