Haley, 41, currently the youngest governor in the US, told her followers on Facebook that she was stuck outside her mansion wearing nothing but her bathrobe.
"What not to do...Getting locked out of the Governor's mansion in your robe while sending the kids off to school," Haley, born as Nimrata Nikki Randhawa to Sikh immigrant parents, said.
A Haley spokesman confirmed the Facebook account, CBS-affiliate WLTX television reported.
The post quickly generated buzz on Facebook, collecting more than 4,400 likes and close to 550 comments last night for the Republican leader.
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Haley is known in South Carolina for her regular and sometimes personal Facebook posts, which her office says she does herself. The subjects of her posts alternate between her daily duties as governor and her life as a mom.
But with the Republican running for re-election in 2014, her political opponents wasted no time pouncing on her morning blunder.
"File this under Fake Transparency, because it certainly is telling about Nikki Haley's priorities when it comes to sharing information with the people of South Carolina," the South Carolina Democratic Party said in a statement.