A prank war has begun.

Sandra Bullock recently recalled the night she was left with a wet and "disintegrating" expensive dress after being fooled by her pal and Gravity costar George Clooney, and now she tells E! News that it's payback time.

And no matter how hard the actor tries to convince Sandy to just let it go, it's not happening.

"He wants me to let it go because he knows its coming back. He's watching me. He knows its coming back," Bullock told us at the Gravity premiere.

George Clooney, Sandra Bullock, Gravity

Michael Loccisano/Getty Images

"He knows its coming back in his direction and he's gonna get it one day…I'm plotting and I'm waiting because he's getting calmer and he thinks everything is sort of done [shrugs]. Maybe it is, maybe its not."

On Friday's Tonight Show with Jay Leno, the actress shared the story of being tricked by Clooney to jump into a pool while at a dinner party. What she didn't know at the time, was she'd be jumping in alone.

"I went to the bathroom and came out and there was George and someone else with just their pants on going, 'We're gonna go in the pool,' and I was like, 'Really?'" she told Leno. "And so I held their hands and on the count of three, and in slow motion I see Nicole Kidman with a stack of towels ... and I jump, and they let go, and I go in the pool."

She continued, "The sad part was I wore this cute little lace dress that I paid a lot of money for, and as I got out, it started disintegrating."

Not the dress! Better watch out, Georgie boy.

Make sure to tune in to E! News weeknights at 7 p.m. & 11:30 p.m.

PHOTOS: See all the women George Clooney has romanced through the years

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