An eagle-eyed fan has snapped a selfie with Michelle and Sasha Obama as they attended a Beyonce and Jay-Z concert in Chicago last night.

Yesenia Herrera was standing in front of the first family at Soldier Field when she whipped out her cell phone and took a selfie - capturing Mrs Obama and her youngest daughter in the background.

Michelle, who was in the city to hold a Democrat fundraiser, and 13-year-old Sasha were also at the concert with Sasha's big sister, Malia, 16.

Herrera, a model from Chicago, then shared the image to Instagram - no doubt to the chagrin of Michelle Obama, who has previously complained about images of her daughters being shared.

The first lady had called a photo agency earlier this month after it shared pictures of Malia walking into a restaurant, arguing that her girls can only be photographed if they're with the president.

Mrs Obama had arrived in Chicago earlier on Thursday to help rake in money for Democrats at a fundraiser at the Waldorf Astoria, CBS2 reported. It was the first time she had visited her home town in a year.

She spoke before more than 100 people at the hotel and urged attendees to help support the mid-term elections.

'We need you to write the biggest, fattest check that you can possibly write,' she said in a 20-minute address, according to a transcript of her remarks provided by the White House.

Donations ranged from $500 to $20,000 each, according to CBS2.

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