Michelle ObamaMichelle LeVaughn Robinson ObamaTrump to meet with Prince Harry during UK visit Michelle Obama to headline Essence Festival Obama shares tribute to Michelle to celebrate Mother's Day MORE’s footwear is causing a fashion frenzy, after the former first lady sported sparkling $4,000 designer boots.

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The “Becoming” author stepped out in the eye-catching pair of Balenciaga boots on Wednesday at a Brooklyn stop on her nationwide book tour. Former “Sex and the City” star and fashion designer Sarah Jessica Parker served as the celebrity guest moderator for the chat about Obama’s best-selling memoir.

The gold, thigh-high boots retail for $3,800, and several sizes were sold out or low in stock on at least one site selling them after Obama's appearance.

Multiple fashion gurus and first lady watchers went wild for the lux look:

But not everyone was a fan of the glittery foot fashion:

The current first lady has also drawn attention for her footwear. Last year, Melania TrumpMelania TrumpTrump arrives in Japan to kick off 4-day state visit Trump to meet with Prince Harry during UK visit The Hill's 12:30 Report: Trump orders more troops to Mideast amid Iran tensions MORE's press office slammed the media for focusing on her high heel shoes as she boarded Air Force One to head to Texas to visit areas damaged by Hurricane Harvey.

In a headline, The Mirror called the stiletto-style shoes the "most inappropriate clothes imaginable."

Stephanie Grisham, Trump's communications director, said in a statement to CNN at the time, "It's sad that we have an active and ongoing natural disaster in Texas, and people are worried about her shoes."

Grisham also knocked the press for another instance of homing in on what Trump was sporting on her feet in a CNN op-ed last week, writing, "When Mrs. Trump invited children from a local Boys and Girls club to help plant vegetables in the White House garden, the media chose to focus on the cost of her shirt and the fact that her shoes were clean."