Stacey Keibler experienced a wardrobe malfunction on Sunday at Monaco's Grand Pix, when her zipper was left open, revealing her underwear.

The 33-year-old, who is currently dating actor George Clooney, smiled for cameras and was seemingly unaware of the fact that she was exposing her pink G-string underwear and some thigh. The zipper of her romper was left open on the left side and her undergarments were revealed when she turned to the side. She wore a short red romper cinched at the waist with a black belt, and studded sandals that had a low heel.

She also had on an oversized black leather handbag and black sunglasses. The photos were taken on the streets of the French Riviera city-state.

See photos of Keibler's wardrobe malfunction here.

Keibler revealed via her Twitter account that she was enjoying Monaco and the Grand Prix over the weekend.

"Heading 2 the palace for cocktails w Prince Albert & Princess Charlene," she wrote on Monday -- noting the day before that she was "so close to all the action" during the Grand Prix race.

On Monday she tweeted that she was heading to the palace to have drinks with Prince Albert and Princess Charlene. She attended the 2013 Cannes Film Festival without her beau, as Clooney stayed behind to finish filming his latest movie, Monuments Men in England. At the film festival, actress Eva Longoria experienced a wardrobe malfunction of her own when she accidentally opened her legs to cameras and exposed that she was not wearing underwear.