George Clooney reportedly plays water balloon pranks with girlfriend, British TV presenter Lisa Snowdon, reports Internet portal Femalefirst.

Hollywood's official practical joker regularly balances water-filled balloons over doors to soak Snowdon when she opens them - often leaving her dripping just when she's dressed to go out for a glamorous evening.

But now she's getting smarter.

"I've learned to watch out for the water-filled balloons. I've been blasted a few times. It's a particular shock to the system if you're holding a glass of red wine and water goes all over you. I'm getting clever now, though," Snowdon said.

"He loves to balance them over doors - and it doesn't matter whether I'm ready to go out or not. I get a gut feeling when he's in a naughty mood, so I look out."