Jessica Alba is a knockout

The Fantastic Four star got to grips with the musclebound sportsman while filming a commercial for YouTube in Los Angeles.

Dressed in orange skinny jeans and a summer blouse, she stepped in the ring and put her fists up in a pathetic show of strength.

But after jumping on the mans bare back and getting him in a headlock, she floored her opponent.

Then she calmly stepped out of the ring and walked into an office building.

Go on girl ... Jessica goes in for the attack

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Cash Warren was on hand to make sure his 30-year-old missus escaped the ring unscathed.

But he neednt have worried the mother-of-two looked like a lady on a mission.

And shes always been a knockout.

Floored ... the hunky fighter is down and out

Xposure