Unfiltered: No Shame, No Regrets, Just Me.

Lily Collins' pen pal? Michelle Obama

Actress Lily Collins took to Instagram to express her excitement about receiving a special missive.

"I can't believe this letter I received from someone I deeply respect and admire," Collins said in the caption to a video she posted. "It's absolutely epic. I'm in complete shock but just had to share!"

Collins then proceeded to read a letter she received from former first lady Michelle Obama.

In the midst of writing her memoir, Obama, apparently, also penned a note of thanks to Collins for her book "Unfiltered: No Shame, No Regrets, Just Me."