Acceptance speeches usually prompt more yawns than gasps, but Katherine Heigl bucked that trend when she received a Best Actress award in Las Vegas late Thursday – and came within a whisker of exposing her boob, The Sun reported.

PHOTOS: HEIGL’S DRESS SUDDENLY STRAPLESS

Executing the lightning-speed reactions of a top flight goalkeeper, Katherine grabbed hold of her broken dress as it rapidly headed south.

Her wardrobe mishap occurred as she took the stage to collect her Female Star of the Year prize at ShoWest’s Final Night Banquet and Award Ceremony.

Explaining why the Knocked Up star was picked for the honor, event official Robert Sunshine said: “Her ever-present charm and innate talent have made Heigl’s transition from TV screen to silver screen seemingly effortless.

“Her comedic timing and flair for acting are showcased in each of her roles and have captivated audiences around the globe.”