Girls' Generation's Seohyun and Kim Chang Wan performed a beautiful duet at the '2015 KBS Music Festival' but she did experience a little hiccup in her singing!

She and veteran singer Kim Chang Wan sang his classic hit song "Memory Below the Window" and she started off beautifully but then around the 38 second mark, she forgot her lyrics! 

It was unlike our perfectionist maknae to make a mistake like that, but it was adorable nonetheless. You can see how she turns away from the camera during that part as she hums along to the melody. 

As the pro she is, she quickly remembers the lyrics again and continues on as if she never made a mistake in the first place. 

You can watch their performance right above.