25 years on, the Obamas are still so in love

Michelle Obama has taken to Twitter to wish her husband of 25 years, former US President Barack Obama, a happy anniversary.

The former first lady tweeted:

"Happy 25th anniversary @barackobama. A quarter of a century later, you're still my best friend & the most extraordinary man I know. I [heart] you."

Michelle and Barack Obama have been married for a quarter of a century. Image: AAP

She posted the sweet words along with a black and white photo from their wedding day on October 3, 1992.

The Obamas first met in 1989 in Chicago while both were working at a law firm. 

Michelle was assigned to be her future husband's mentor during his time as a summer associate.

The former president and first lady have been enjoying their time out of the White House. Image: AAP

Nearly three decades later and the power couple have accomplished so much together, not least of which is a long a happy marriage and raising two beautiful daughters together, Sasha, 16, and Malia, 19.

The couple just dropped Malia off at college, with Barack Obama telling a reception last week it was a difficult moment.

"I dropped off Malia at college, and I was saying to Joe and Jill (Biden) that it was a little bit like open-heart surgery, and I was proud that I did not cry in front of her," he said.

"But on the way back, the Secret Service was off, looking straight ahead, pretending they weren't hearing me as I sniffled and blew my nose. It was rough."