President Joe Biden has committed a blunder - and the internet isn't about to let him forget it.

While introducing a Women's History Month celebration at the White House, the president accidentally referred to Vice President Kamala Harris as "the first lady" instead of "the vice president".

To make matters worse, Biden was talking about Harris' husband - so when he said "the first lady's husband", he unwittingly referred to himself.

The mix-up happened while Biden was explaining that Harris couldn't be present at the event because her husband (second gentleman Doug Emhoff) had tested positive for Covid-19 the previous day.

"There’s been a little change in arrangement of who is on the stage because of the first lady’s husband contracting Covid," he said, per a video of the moment posted on Twitter by Reuters.

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Somebody offstage to Biden's right can then be heard correcting the president - to which the audience laughs good-naturedly. When the president realizes his gaffe, he appears unfazed and carries on the joke as if he meant to refer to himself. "Oh no, she's fine - it's me!" he said, eliciting a big laugh from his audience.

Biden may have charmed the White House guests, but many people on Twitter were less easily appeased and took the opportunity to criticize and ridicule the president.

"Oh Good Lord," wrote one.

"Does Jill know?" a different user joked.

"Good God," a third person chimed in.

"You’d be mocking Trump if he said the same thing," wrote a final commenter.

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However, others were more forgiving, and argued that Biden had made an easy mistake over confusing titles.

"These terms are confusing. Anyone can make that mistake," one person commented, while another agreed, writing: "I suspect he was going for “first husband” and misspoke. To be fair we’ve never had one."

A third user joined them in defending Biden, tweeting "A little sense of humor please," in response to negative comments. What's more, a fourth echoed their views, writing: "you call this News, he corrected himself, shame on you!"

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Featured Image Credit: MediaPunch Inc / Alamy

Social media responds as Joe Biden mistakenly refers to Kamala Harris as the 'first lady'