A group of Native American students from Montana got the surprise of their lives earlier this month while visiting Sidwell Friends School in Washington DC as part of an exchange program.

Nine students from Browning High School were giving presentations on Native American culture to some of the younger students at the private Quaker school on the morning of March 17 when they and and their teacher, Amy Conrey Andreas, were suddenly ushered into a conference room.

Then, before the students had time to figure out what was going on, in walked Michelle Obama.

The former first lady had apparently been on campus that morning to meet with one of daughter Sasha's counselors, and while that appointment was wrapping up had been asked if there was any chance she might be willing to stop in and say a quick hello to the students.

Michelle did not however want to go say a quick hello to the students, who are all part of Browning’s Human Rights Club, and instead decided to spend her day with the young men and women of the Blackfeet Nation.

For the next few hours the nine students and their very emotional teacher hugged, posed for selfies and listened while Michelle spoke to them about success, privilege and the importance of education.

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Gather round: Michelle Obama surprised a group of students from Blackfeet Nation (above) who were visiting Sidwell Friends as part of a cultural exchange program

Opening up: The high school students were in Washington DC for a week and delivering a presentation on Native American culture when they were whisked away

Fawning over the former first lady: After the nine students from Montana and their teacher were in a room alone, Michelle Obama suddenly walked in and greeted them with hugs

Favor: Michelle had been visiting with her daughter Sasha's counselor and was asked that morning if she might say a quick hello to the group

Quick chat: She then sat down and spoke to the group for a few hours while also taking selfies and encouraging the youngsters to give back to their community

Andreas posted a video later that day which showed Michelle speaking to the group for eight straight minutes about her own goals growing up and the importance of being a leader.

She told the group of Native students at the start of the video: 'It is going to be so important for you to be strong leaders so you can help your communities. That was my whole thing when I thought about law school, when I thought about what I wanted to do.

'I didn't keep practicing law because I wanted to pick a career that allowed me to go back to my neighborhood and my community. But I had to get the education and the experience to bring something back and just think about it now. We're about to build a multi-million dollar library right in my neighborhood.

'The presidential library is going to be located 10 minutes from where I grew up.'

Michelle also explained how growing up in Chicago was in some ways very much like the lives of the students from Browning, saying: 'Many people in big cities live like kids on reservations, they are isolated. They're limited.'

She went on to detail how people become 'trapped' in their communities.

Michelle also congratulated the kids on their success already in being accomplished enough to get selected for the trip across the country, and reminded the teens to not be too critical of themselves and to always ask questions.

In her parting message she told the group: 'Let your life speak!'

Big day: In a video posted by teacher Amy Conrey Andreas (above) Michelle spoke to the group for eight straight minutes about her own goals growing up

Lessons: 'It is going to be so important for you to be strong leaders so you can help your communities,' said Michelle

Excitement: 'We're about to build a multi-million dollar library right in my neighborhood. 'The presidential library is going to be located 10 minutes from where I grew up,' said Michelle

Proud first lady: Michelle also congratulated the kids on their success already in being accomplished enough to get selected for the trip across the country

Andreas and the students arrived in DC on March 13 for their week at Sidwell, whose alumni include Malia Obama, Chelsea Clinton and Tricia Nixon.

The teacher documented Michelle's talk with the children in a series of photos in addition to the video, writing: 'She could have talked for hours and we wouldn't have moved...except me, I would've needed more Kleenex eventually.'

Andreas then posted two photos of herself crying while hugging the first lady.

Michelle and Sasha in June 2016 (above)

A few days later Andreas also shared the photo of her students giving their presentation just moments before they were escorted off to meet Michelle.

'In all the excitement the other day, I forgot to post a picture of the students at their last presentation, wrote Andreas.

'They didn't know it yet but they were just about to be whisked away to their meeting with Mrs. Obama.

She then added: 'They were fabulous presenters!'

A number of students also shared their selfies and pictures with Michelle later as well, while writing how amazing it was to meet the former first lady.

Details of Michelle's days as first lady will soon be shared in detail thanks to the memoir she is working on, which earned her a record-breaking advance that was higher than ant other first time author has received in publishing history.

Reports just before Michelle and her husband signed their joint book deal put the price being offered for global rights to their memoirs at over $60million.

And while Barack may be the bigger name worldwide, he has already written two books while Michelle has yet to share personal stories of her life in a memoir.

There is no release date for either book at this time, but if Michelle's is written anything like her speeches it should have no problem conquering the bestseller list.

And maybe even beating out Barack.