Michelle Obama's most memorable looks as first lady

First lady Michelle Obama is never boring when it comes to style, and Monday at the Democratic National Convention was no exception.

Mrs. Obama wore a custom-made royal blue dress by American designer Christian Siriano to stump for Hillary Clinton at the convention's opening night in Philadelphia.

It was just the latest colorful addition to a long line of buzzed-about dresses worn by the first lady, who has become known for a more modern, experimental style than her predecessors.

Here are five of the first lady's looks we won't soon forget:

2008 Democratic National Convention

2009, first inaugural ball

2012 Democratic National Convention

2013, second inaugural ball

2016, White House Correspondents' Dinner

The Associated Press contributed to this report.