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Ain't nothin' but a G-string for Stacy Keibler! George Clooney's actress/model girlfriend made a solo appearance in Monaco on Sunday, May 27 for its annual, super-duper glitzy Grand Prix. Happily posing for a photographer on the streets of the posh French Riviera city-state, Keibler, 33, looked sexy and carefree as ever in a short, red, belted romper that showcased her slim toned arms and legs -- and an embarrassing glimpse of pink G-string underwear underneath!

PHOTOS: Most embarrassing wardrobe malfunctions of all time

With the former pro wrestler grinning, seemingly oblivious, cameras caught a busted zipper on the right side of the romper at the waistline, revealing her pink underwear beneath.

She took to Twitter to comment about her minor wardrobe malfunction. "At least zip slips are better than nip slips...#oopsie," she shared.

PHOTOS: Stacy and George's glitzy romance

Keibler reported from her Twitter account that she was soaking up the glitz and glamour of 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 itself.

PHOTOS: Stacy's bikini body

Her love Clooney, 52, has been shooting "The Monuments Men" elsewhere in Europe.


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